Ssl STA135 User manual

Troubleshooting
STA120 • STA135 Amplifier User’s Manual - page 10
Specifications
STA120 • STA135 Amplifier User’s Manual - page 11
STA120 • STA135 Amplifier User’s Manual - page 6
CONTENTS
U S E R ’ S M A N U A L
STA120 • STA135 Amplifier User’s Manual - page 4
STA120 • STA135 Amplifier User’s Manual - page 3
STA120 • STA135 Amplifier User’s Manual - page 8
STA120 • STA135 Amplifier User’s Manual - page 5
STA120 • STA135 Amplifier User’s Manual - page 7
STA120 • STA135 Amplifier User’s Manual - page 9
STA120 • STA135 Amplifier User’s Manual - page 2
Introduction
Important installation
considerationsfor using
this amplifier.
Notes
If you experience operation or performance problems with this product, compare your
installation with the electrical wiring diagram on the previous pages. If problems persist,
read the following troubleshooting tips which may help eliminate the problems.
Low-level (RCA) input wiring is preferred for best audio performance. Always use
a high-quality RCA cable for best audio performance.
Protection LED
comes on when
amplifier is
powered up.
Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving.
Remote speaker leads, andreset the amplifier. If the Protection LED still
comes on, then the amplifier is faulty and needs servicing.
High hiss in the
speakers.
Disconnect all RCA inputs to the amplifiers. If the hiss disappears,then
plug in the component driving the amplifier and unplug its inputs. If the
hiss disappears at this point, go on until the faulty/noisy component is
found.
It is best to set the amplifier's input level control as low as possible. The
best subjective signal-to-noise ratio is achieved in this manner. Try to set
the head unit as high as possible (without distortion) andthe amp input
level as low as possible.
Squealing noise
from speakers.
Check for improperly grounded RCA interconnects.
Distorted sound.Check that the Input Level Control is set to match the signal level of the
head unit. Always try to set the Input Level as low as possible.
Check thatall crossover frequencies are properly set.
Check for short circuits on the speakerleads.
Amplifier gets
very hot.
Check that the minimum speaker impedance for the amp model is correct.
Check thatthere is good air circulationaroundthe amp. In some
applications, it may be necessary to add andexternal cooling fan.
Engine noise
(static type)
This is usually caused by poor quality RCA cables,which can pick up
radiated noise. Use only the best quality cables, androute them away
from power cables.
Engine noise
(alternator
whine)
Check thatspeaker leads are not shorted to the vehicle chassis.
Check thatthe RCA grounds are not shorted to the vehicle chassis.
Check thatthe head unit is properly grounded.
Thefuse rating for the amp is 60A
(using two 30A fuses) forthe STA120
and 90A (using three 30A fuses) for
the STA135. Although sufficient for
normal working conditions,
overloading the amp may result in
blown fuses. Please try to avoid
overloading the amp in this manner.
Your Stealth Class D amplifier
is designed to run with a min-
imum load of 1 Ohm.
Operating the STA120 or
STA135 with a speaker imped-
ance load below 1 Ohm may
result in poor sound quality
and damage to the amplifier
circuitry. Such damage is not
covered under the warranty
for this product.
Bridging Two STA120 or Two STA135 Amplifiers
MASTER
AMPLIFIER
SLAVE
AMPLIFIER
Power Connections
Without Stiffening Capacitor
With Stiffening
Capacitor
Bridging Two STA120 or Two STA135 Amplifiers
SLAVE
AMPLIFIER
INPUT, SPEAKER AND DATALINK CONNECTIONS
(SEE NEXT PAGE FOR POWERCONNECTIONS)
POWER CONNECTIONS
(SEE PREVIOUS PAGE FOR INPUT, SPEAKER AND DATALINK CONNECTIONS)
• If there is smoke or anypeculiar odor
present during use or if there is damage
to any of the component enclosures,
immediately unplug the power cord
and send the amplifier to your local
dealer or service center as soon as
possible .
3. Mark the location for the mounting
hole screws by positioning the amplifier
where you wish to install it. Use a scribe
or mounting screw, inserted through
each of the amp's mounting holes, to
mark the mounting surface. If the
mounting surface is carpeted, measure
the hole centers and mark with a felt
tip pen.
4. Drill pilot holes in the mounting
surface for the mounting screws. Place
the amplifier in position, and attach
the amplifier to the mounting surface
securely using screws.
4. Check that the fuse holder is empty.
Then connect the fuseholder to the
"BATT+" connection on the amplifier.
5. If multiple amplifiersare being used
in your system, either:
• Run a separate pair of cables from
the battery and a chassis ground point
to each amplifier. Each (+) cable must
have its own inline fuse.
-or-
• Run a #0 cable from the fuse holder
at the battery to a distribution block
at or near the amplifier's location. Then
run separate cables from the amplifier
to this distribution block and to
independent chassis ground points.
6. Connect all line inputs and outputs
(if used) using high-quality cables.
Connect all speakers, following the
diagrams in this manual. Be sure to
observe proper polarity to avoid audio
phase problems.
7. Insert fuse(s) into the battery fuse
holder(s).
8. Recheck all connections before
powering up the amplifier.
9. Set all level controls to minimum
position, and set all crossover
controls/switches to the desired
frequency points.
10. Power up the head unit and the
amplifier. Then set the volume control
on the head unit to about 3/4 volume,
and adjust the amplifier’s input level
control(s) to just below the level of
distortion.
11. Further fine tuning of the various
controls may be necessary to obtain
best results.
Speaker Connections
MASTER
AMPLIFIER
2Introduction
2Features
3What is included?
3General precautions
3Installation precautions
3Mounting the amplifier
4Connecting the amplifier
5Important system considerations
5Tips for a safe system
6Low level input wiring
6Speaker wiring
7Power connections
Normal and with Stiffening Capacitor
8Bridging twoStealth
CLASS D Amplifiers
10 Troubleshooting
11 Specifications
Congratulations on your
purchase of a Sound Storm
Laboratories STEALTH
Class D Amplifier.
It has been designed, engineered
and manufactured to bring you
the highest level of performance
and quality, and will afford you
years of listening pleasure.
Thank you for making Sound
Storm Laboratories your choice
for car audio entertainment!
All specifications subject to
change without notice.
RMS POWER
into 4 Ohms
RMS POWER
into 2 Ohms
MAX POWER
into 2 Ohms
MAX POWER
into 1 Ohm
Min. speaker
impedance
Input
impedance
Input
sensitivity
Frequency response
Signal-to-noise ratio
Crossover/filter range
low pass
subsonic
Bass Boost
Phase Shift
Fuse rating
Dimensions:
(11-3/4" x 3" x ...)
1000Wx 1
1200Wx 1
1500Wx 1
2000Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 2
11-3/8"
MODEL
page
STA120
STA135
CLASS D MonoBlock
Car Audio Amplifiers
CLASS D
MonoBlock Car Audio
Amplifier
1400Wx 1
2000Wx 1
2600Wx 1
3500Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 3
12-1/2"
CLASS D
MonoBlock Car Audio
Amplifier
SYMPTOM POSSIBLE REMEDY
STA120 • STA135 Amplifier User’s Manual - page 1
BRIDGED MODE
SWITCH IN MASTER
POSITION
BRIDGED MODE
SWITCH IN SLAVE
POSITION
To Audio Outputs of head
unit or Subwoofer outputs
of a signal processor
To Audio Inputs of
satellite amplifier
(if present)
To Audio Outputs of head unit
or Subwoofer outputs of a
signal processor
Chassis
ground
point

Troubleshooting
STA120 • STA135 Amplifier User’s Manual - page 10
Specifications
STA120 • STA135 Amplifier User’s Manual - page 11
STA120 • STA135 Amplifier User’s Manual - page 6
CONTENTS
U S E R ’ S M A N U A L
STA120 • STA135 Amplifier User’s Manual - page 4
STA120 • STA135 Amplifier User’s Manual - page 3
STA120 • STA135 Amplifier User’s Manual - page 8
STA120 • STA135 Amplifier User’s Manual - page 5
STA120 • STA135 Amplifier User’s Manual - page 7
STA120 • STA135 Amplifier User’s Manual - page 9
STA120 • STA135 Amplifier User’s Manual - page 2
Introduction
Important installation
considerationsfor using
this amplifier.
Notes
If you experience operation or performance problems with this product, compare your
installation with the electrical wiring diagram on the previous pages. If problems persist,
read the following troubleshooting tips which may help eliminate the problems.
Low-level (RCA) input wiring is preferred for best audio performance. Always use
a high-quality RCA cable for best audio performance.
Protection LED
comes on when
amplifier is
powered up.
Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving.
Remote speaker leads, andreset the amplifier. If the Protection LED still
comes on, then the amplifier is faulty and needs servicing.
High hiss in the
speakers.
Disconnect all RCA inputs to the amplifiers. If the hiss disappears,then
plug in the component driving the amplifier and unplug its inputs. If the
hiss disappears at this point, go on until the faulty/noisy component is
found.
It is best to set the amplifier's input level control as low as possible. The
best subjective signal-to-noise ratio is achieved in this manner. Try to set
the head unit as high as possible (without distortion) andthe amp input
level as low as possible.
Squealing noise
from speakers.
Check for improperly grounded RCA interconnects.
Distorted sound.Check that the Input Level Control is set to match the signal level of the
head unit. Always try to set the Input Level as low as possible.
Check thatall crossover frequencies are properly set.
Check for short circuits on the speakerleads.
Amplifier gets
very hot.
Check that the minimum speaker impedance for the amp model is correct.
Check thatthere is good air circulationaroundthe amp. In some
applications, it may be necessary to add andexternal cooling fan.
Engine noise
(static type)
This is usually caused by poor quality RCA cables,which can pick up
radiated noise. Use only the best quality cables, androute them away
from power cables.
Engine noise
(alternator
whine)
Check thatspeaker leads are not shorted to the vehicle chassis.
Check thatthe RCA grounds are not shorted to the vehicle chassis.
Check thatthe head unit is properly grounded.
Thefuse rating for the amp is 60A
(using two 30A fuses) forthe STA120
and 90A (using three 30A fuses) for
the STA135. Although sufficient for
normal working conditions,
overloading the amp may result in
blown fuses. Please try to avoid
overloading the amp in this manner.
Your Stealth Class D amplifier
is designed to run with a min-
imum load of 1 Ohm.
Operating the STA120 or
STA135 with a speaker imped-
ance load below 1 Ohm may
result in poor sound quality
and damage to the amplifier
circuitry. Such damage is not
covered under the warranty
for this product.
Bridging Two STA120 or Two STA135 Amplifiers
MASTER
AMPLIFIER
SLAVE
AMPLIFIER
Power Connections
Without Stiffening Capacitor
With Stiffening
Capacitor
Bridging Two STA120 or Two STA135 Amplifiers
SLAVE
AMPLIFIER
INPUT, SPEAKER AND DATALINK CONNECTIONS
(SEE NEXT PAGE FOR POWERCONNECTIONS)
POWER CONNECTIONS
(SEE PREVIOUS PAGE FOR INPUT, SPEAKER AND DATALINK CONNECTIONS)
With the SoundStorm Laboratories
STEALTH STA120 and STA135, we are
introducing two new CLASS D
amplifiers,both designed in the USA.
These STEALTH models feature
variable lowpass and subsonic filters
and a variable input gain control. The
STA120 and STA135 also incorporate
a phase selector switch to help
compensate for time delays in
subwoofer applications.
For further flexibility in the use of a
subwoofer, a variable 0-+18dB Bass
Boost control has been included.You
can control the subwoofer level with
the remote level control module.
Sound Storm Laboratories
understands that amplifiers are placed
in many different kinds of installations,
so we have also included an input
sensitivity control to help you integrate
the amp into your system regardless
of the nature of your input source.
A special feature on this Class D amp
is DataLink circuitry, which allows you
to “strap” together two STA120’s or
two STA135 models for an astounding
total maximum output power of 4000
or 6000 watts, respectively.
Features
Your new STEALTH amplifier features
the following:
• Class D operation
• MOSFET PWM (Pulse Width
Modulated) Power Supply
• One Ohm stable mono operation
• Thermal, overload and speaker
shortprotection
• Soft turn-on circuit
• Remote turn-on/turn-off circuit
• Variable input gaincontrol
• Input voltage sensitivity selector
• Variable subsonic filter: 15-40 Hz,
12dB/octave
•Variable low pass filter: 50-150 Hz,
12dB/octave
• Variable 0-+18dB Bass Boost
• 0/180º Phase Shift selector
• Nickel-plated RCA low level inputs
• Nickel-plated speaker and power
terminals
• LED power and protection
indicators
• Silver anodized heatsink
• Remote subwoofer level control
• If there is smoke or anypeculiar odor
present during use or if there is damage
to any of the component enclosures,
immediately unplug the power cord
and send the amplifier to your local
dealer or service center as soon as
possible .
3. Mark the location for the mounting
hole screws by positioning the amplifier
where you wish to install it. Use a scribe
or mounting screw, inserted through
each of the amp's mounting holes, to
mark the mounting surface. If the
mounting surface is carpeted, measure
the hole centers and mark with a felt
tip pen.
4. Drill pilot holes in the mounting
surface for the mounting screws. Place
the amplifier in position, and attach
the amplifier to the mounting surface
securely using screws.
4. Check that the fuse holder is empty.
Then connect the fuseholder to the
"BATT+" connection on the amplifier.
5. If multiple amplifiersare being used
in your system, either:
• Run a separate pair of cables from
the battery and a chassis ground point
to each amplifier. Each (+) cable must
have its own inline fuse.
-or-
• Run a #0 cable from the fuse holder
at the battery to a distribution block
at or near the amplifier's location. Then
run separate cables from the amplifier
to this distribution block and to
independent chassis ground points.
6. Connect all line inputs and outputs
(if used) using high-quality cables.
Connect all speakers, following the
diagrams in this manual. Be sure to
observe proper polarity to avoid audio
phase problems.
7. Insert fuse(s) into the battery fuse
holder(s).
8. Recheck all connections before
powering up the amplifier.
9. Set all level controls to minimum
position, and set all crossover
controls/switches to the desired
frequency points.
10. Power up the head unit and the
amplifier. Then set the volume control
on the head unit to about 3/4 volume,
and adjust the amplifier’s input level
control(s) to just below the level of
distortion.
11. Further fine tuning of the various
controls may be necessary to obtain
best results.
Speaker Connections
MASTER
AMPLIFIER
2Introduction
2Features
3What is included?
3General precautions
3Installation precautions
3Mounting the amplifier
4Connecting the amplifier
5Important system considerations
5Tips for a safe system
6Low level input wiring
6Speaker wiring
7Power connections
Normal and with Stiffening Capacitor
8Bridging two Stealth
CLASS D Amplifiers
10 Troubleshooting
11 Specifications
Congratulations on your
purchase of a Sound Storm
Laboratories STEALTH
Class D Amplifier.
It has been designed, engineered
and manufactured to bring you
the highest level of performance
and quality, and will afford you
years of listening pleasure.
Thank you for making Sound
Storm Laboratories your choice
for car audio entertainment!
All specifications subject to
change without notice.
RMS POWER
into 4 Ohms
RMS POWER
into 2 Ohms
MAX POWER
into 2 Ohms
MAX POWER
into 1 Ohm
Min. speaker
impedance
Input
impedance
Input
sensitivity
Frequency response
Signal-to-noise ratio
Crossover/filter range
low pass
subsonic
Bass Boost
Phase Shift
Fuse rating
Dimensions:
(11
-3/4
" x 3" x ...)
1000Wx 1
1200Wx 1
1500Wx 1
2000Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 2
11-3/8"
MODEL
page
STA120
STA135
CLASS D MonoBlock
Car Audio Amplifiers
CLASS D
MonoBlock Car Audio
Amplifier
1400Wx 1
2000Wx 1
2600Wx 1
3500Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 3
12-1/2"
CLASS D
MonoBlock Car Audio
Amplifier
SYMPTOM POSSIBLE REMEDY
STA120 • STA135 Amplifier User’s Manual - page 1
BRIDGED MODE
SWITCH IN MASTER
POSITION
BRIDGED MODE
SWITCH IN SLAVE
POSITION
To Audio Outputs of head
unit or Subwoofer outputs
of a signal processor
To Audio Inputs of
satellite amplifier
(if present)
To Audio Outputs of head unit
or Subwoofer outputs of a
signal processor
Chassis
ground
point

Troubleshooting
STA120 • STA135 Amplifier User’s Manual - page 10
Specifications
STA120 • STA135 Amplifier User’s Manual - page 11
STA120 • STA135 Amplifier User’s Manual - page 6
CONTENTS
U S E R ’ S M A N U A L
STA120 • STA135 Amplifier User’s Manual - page 4
STA120 • STA135 Amplifier User’s Manual - page 3
STA120 • STA135 Amplifier User’s Manual - page 8
STA120 • STA135 Amplifier User’s Manual - page 5
STA120 • STA135 Amplifier User’s Manual - page 7
STA120 • STA135 Amplifier User’s Manual - page 9
STA120 • STA135 Amplifier User’s Manual - page 2
Introduction
Important installation
considerationsfor using
this amplifier.
Notes
If you experience operation or performance problems with this product, compare your
installation with the electrical wiring diagram on the previous pages. If problems persist,
read the following troubleshooting tips which may help eliminate the problems.
Low-level (RCA) input wiring is preferred for best audio performance. Always use
a high-quality RCA cable for best audio performance.
Protection LED
comes on when
amplifier is
powered up.
Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving.
Remote speaker leads, andreset the amplifier. If the Protection LED still
comes on, then the amplifier is faulty and needs servicing.
High hiss in the
speakers.
Disconnect all RCA inputs to the amplifiers. If the hiss disappears,then
plug in the component driving the amplifier and unplug its inputs. If the
hiss disappears at this point, go on until the faulty/noisy component is
found.
It is best to set the amplifier's input level control as low as possible. The
best subjective signal-to-noise ratio is achieved in this manner. Try to set
the head unit as high as possible (without distortion) andthe amp input
level as low as possible.
Squealing noise
from speakers.
Check for improperly grounded RCA interconnects.
Distorted sound.Check that the Input Level Control is set to match the signal level of the
head unit. Always try to set the Input Level as low as possible.
Check thatall crossover frequencies are properly set.
Check for short circuits on the speakerleads.
Amplifier gets
very hot.
Check that the minimum speaker impedance for the amp model is correct.
Check thatthere is good air circulationaroundthe amp. In some
applications, it may be necessary to add andexternal cooling fan.
Engine noise
(static type)
This is usually caused by poor quality RCA cables,which can pick up
radiated noise. Use only the best quality cables, androute them away
from power cables.
Engine noise
(alternator
whine)
Check thatspeaker leads are not shorted to the vehicle chassis.
Check thatthe RCA grounds are not shorted to the vehicle chassis.
Check thatthe head unit is properly grounded.
Installation precautions
Before you drill or cut any holes,
investigate your car's layout very
carefully. Take special care when you
work near the gas tank, fuel lines,
hydraulic lines and electrical wiring.
Never operate the amplifier when it is
unmounted. Attach all audio system
components securely to prevent
damage, especially in an accident.
Before making or breaking power
connections in your system, disconnect
the vehicle battery. Confirm that your
head unit or other equipment is turned
off while connecting the input jacks and
speaker terminals.
If you need to replace the power fuse,
replace it only with a fuse identical to
that supplied with the amplifier. Using
a fuse of a different type or rating may
result in damage to your audio system
or your amplifier which is not covered
by the manufacturer's warranty.
Mounting the amplifier
1. Find a suitable location in the vehicle
in which to mount the amplifier.
2. Make sure there is sufficient air
circulation around the intended
mounting location.
Thefuse rating for the amp is 60A
(using two 30A fuses) forthe STA120
and 90A (using three 30A fuses) for
the STA135. Although sufficient for
normal working conditions,
overloading the amp may result in
blown fuses. Please try to avoid
overloading the amp in this manner.
Your Stealth Class D amplifier
is designed to run with a min-
imum load of 1 Ohm.
Operating the STA120 or
STA135 with a speaker imped-
ance load below 1 Ohm may
result in poor sound quality
and damage to the amplifier
circuitry. Such damage is not
covered under the warranty
for this product.
Bridging Two STA120 or Two STA135 Amplifiers
MASTER
AMPLIFIER
SLAVE
AMPLIFIER
Power Connections
Without Stiffening Capacitor
With Stiffening
Capacitor
Bridging Two STA120 or Two STA135 Amplifiers
SLAVE
AMPLIFIER
INPUT, SPEAKER AND DATALINK CONNECTIONS
(SEE NEXT PAGE FOR POWERCONNECTIONS)
POWER CONNECTIONS
(SEE PREVIOUS PAGE FOR INPUT, SPEAKER AND DATALINK CONNECTIONS)
General precautions
Before installing and usingyour new
Sound Storm Laboratories amplifier,
please become familiar with all the
information contained in this manual.
Please keep this manual in a safe
place for future reference.
• Do not open or attempt to repair this
unit yourself. Dangerous high voltages
arepresent which may result in electric
shock. Refer any repairs to a qualified
service technician.
• To avoid risk of electronic shock or
damage to the amplifier, do not permit
any of this equipment to become damp
or wet from water or drinks. If this does
occur, immediately unplug the power
wires and send the amplifier to your
local dealer or service center as soon
as possible.
• If there is smoke or anypeculiar odor
present during use or if there is damage
to any of the component enclosures,
immediately unplug the power cord
and send the amplifier to your local
dealer or service center as soon as
possible .
3. Mark the location for the mounting
hole screws by positioning the amplifier
where you wish to install it. Use a scribe
or mounting screw, inserted through
each of the amp's mounting holes, to
mark the mounting surface. If the
mounting surface is carpeted, measure
the hole centers and mark with a felt
tip pen.
4. Drill pilot holes in the mounting
surface for the mounting screws. Place
the amplifier in position, and attach
the amplifier to the mounting surface
securely using screws.
4. Check that the fuse holder is empty.
Then connect the fuseholder to the
"BATT+" connection on the amplifier.
5. If multiple amplifiersare being used
in your system, either:
• Run a separate pair of cables from
the battery and a chassis ground point
to each amplifier. Each (+) cable must
have its own inline fuse.
-or-
• Run a #0 cable from the fuse holder
at the battery to a distribution block
at or near the amplifier's location. Then
run separate cables from the amplifier
to this distribution block and to
independent chassis ground points.
6. Connect all line inputs and outputs
(if used) using high-quality cables.
Connect all speakers, following the
diagrams in this manual. Be sure to
observe proper polarity to avoid audio
phase problems.
7. Insert fuse(s) into the battery fuse
holder(s).
8. Recheck all connections before
powering up the amplifier.
9. Set all level controls to minimum
position, and set all crossover
controls/switches to the desired
frequency points.
10. Power up the head unit and the
amplifier. Then set the volume control
on the head unit to about 3/4 volume,
and adjust the amplifier’s input level
control(s) to just below the level of
distortion.
11. Further fine tuning of the various
controls may be necessary to obtain
best results.
Speaker Connections
MASTER
AMPLIFIER
2Introduction
2Features
3What is included?
3General precautions
3Installation precautions
3Mounting the amplifier
4Connecting the amplifier
5Important system considerations
5Tips for a safe system
6Low level input wiring
6Speaker wiring
7Power connections
Normal and with Stiffening Capacitor
8Bridging two Stealth
CLASS D Amplifiers
10 Troubleshooting
11 Specifications
Congratulations on your
purchase of a Sound Storm
Laboratories STEALTH
Class D Amplifier.
It has been designed, engineered
and manufactured to bring you
the highest level of performance
and quality, and will afford you
years of listening pleasure.
Thank you for making Sound
Storm Laboratories your choice
for car audio entertainment!
All specifications subject to
change without notice.
RMS POWER
into 4 Ohms
RMS POWER
into 2 Ohms
MAX POWER
into 2 Ohms
MAX POWER
into 1 Ohm
Min. speaker
impedance
Input
impedance
Input
sensitivity
Frequency response
Signal-to-noise ratio
Crossover/filter range
low pass
subsonic
Bass Boost
Phase Shift
Fuse rating
Dimensions:
(11
-3/4
" x 3" x ...)
1000Wx 1
1200Wx 1
1500Wx 1
2000Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 2
11-3/8"
MODEL
page
STA120
STA135
CLASS D MonoBlock
Car Audio Amplifiers
CLASS D
MonoBlock Car Audio
Amplifier
1400Wx 1
2000Wx 1
2600Wx 1
3500Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 3
12-1/2"
CLASS D
MonoBlock Car Audio
Amplifier
SYMPTOM POSSIBLE REMEDY
What is included?
When first unpacking your new
amplifier, please check first that the
package contains all of the items
below. If something is missing, contact
the store where you purchased the
player.
• Class D amplifier
• Remote subwoofer level control
• Remote subwoofer control cable
•DataLink cable (for strapping two
identical Stealth Class D amps
together)
• Four (4) mounting screws
STA120 • STA135 Amplifier User’s Manual - page 1
BRIDGED MODE
SWITCH IN MASTER
POSITION
BRIDGED MODE
SWITCH IN SLAVE
POSITION
To Audio Outputs of head
unit or Subwoofer outputs
of a signal processor
To Audio Inputs of
satellite amplifier
(if present)
To Audio Outputs of head unit
or Subwoofer outputs of a
signal processor
Chassis
ground
point

Troubleshooting
STA120 • STA135 Amplifier User’s Manual - page 10
Specifications
STA120 • STA135 Amplifier User’s Manual - page 11
STA120 • STA135 Amplifier User’s Manual - page 6
CONTENTS
U S E R ’ S M A N U A L
STA120 • STA135 Amplifier User’s Manual - page 4
STA120 • STA135 Amplifier User’s Manual - page 3
STA120 • STA135 Amplifier User’s Manual - page 8
STA120 • STA135 Amplifier User’s Manual - page 5
STA120 • STA135 Amplifier User’s Manual - page 7
STA120 • STA135 Amplifier User’s Manual - page 9
STA120 • STA135 Amplifier User’s Manual - page 2
Introduction
Important installation
considerationsfor using
this amplifier.
Notes
If you experience operation or performance problems with this product, compare your
installation with the electrical wiring diagram on the previous pages. If problems persist,
read the following troubleshooting tips which may help eliminate the problems.
Low-level (RCA) input wiring is preferred for best audio performance. Always use
a high-quality RCA cable for best audio performance.
Protection LED
comes on when
amplifier is
powered up.
Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving.
Remote speaker leads, andreset the amplifier. If the Protection LED still
comes on, then the amplifier is faulty and needs servicing.
High hiss in the
speakers.
Disconnect all RCA inputs to the amplifiers. If the hiss disappears,then
plug in the component driving the amplifier and unplug its inputs. If the
hiss disappears at this point, go on until the faulty/noisy component is
found.
It is best to set the amplifier's input level control as low as possible. The
best subjective signal-to-noise ratio is achieved in this manner. Try to set
the head unit as high as possible (without distortion) andthe amp input
level as low as possible.
Squealing noise
from speakers.
Check for improperly grounded RCA interconnects.
Distorted sound.Check that the Input Level Control is set to match the signal level of the
head unit. Always try to set the Input Level as low as possible.
Check thatall crossover frequencies are properly set.
Check for short circuits on the speakerleads.
Amplifier gets
very hot.
Check that the minimum speaker impedance for the amp model is correct.
Check thatthere is good air circulationaroundthe amp. In some
applications, it may be necessary to add andexternal cooling fan.
Engine noise
(static type)
This is usually caused by poor quality RCA cables,which can pick up
radiated noise. Use only the best quality cables, androute them away
from power cables.
Engine noise
(alternator
whine)
Check thatspeaker leads are not shorted to the vehicle chassis.
Check thatthe RCA grounds are not shorted to the vehicle chassis.
Check thatthe head unit is properly grounded.
Thefuse rating for the amp is 60A
(using two 30A fuses) forthe STA120
and 90A (using three 30A fuses) for
the STA135. Although sufficient for
normal working conditions,
overloading the amp may result in
blown fuses. Please try to avoid
overloading the amp in this manner.
Your Stealth Class D amplifier
is designed to run with a min-
imum load of 1 Ohm.
Operating the STA120 or
STA135 with a speaker imped-
ance load below 1 Ohm may
result in poor sound quality
and damage to the amplifier
circuitry. Such damage is not
covered under the warranty
for this product.
Bridging Two STA120 or Two STA135 Amplifiers
MASTER
AMPLIFIER
SLAVE
AMPLIFIER
Power Connections
Without Stiffening Capacitor
With Stiffening
Capacitor
Bridging Two STA120 or Two STA135 Amplifiers
SLAVE
AMPLIFIER
INPUT, SPEAKER AND DATALINK CONNECTIONS
(SEE NEXT PAGE FOR POWERCONNECTIONS)
POWER CONNECTIONS
(SEE PREVIOUS PAGE FOR INPUT, SPEAKER AND DATALINK CONNECTIONS)
• If there is smoke or any peculiar odor
present during use or if there is damage
to any of the componentenclosures,
immediately unplug the power cord
and send the amplifier to your local
dealer or service center as soon as
possible .
3. Mark the location for the mounting
hole screws by positioning the amplifier
where you wish to install it. Use a scribe
or mounting screw, inserted through
each of the amp's mounting holes, to
mark the mounting surface. If the
mounting surface is carpeted, measure
the hole centers and mark with a felt
tip pen.
4. Drill pilot holes in the mounting
surface for the mounting screws. Place
the amplifier in position, and attach
the amplifier to the mounting surface
securely using screws.
Before doing any wiring,look through
this manual andidentify the diagrams
to follow forpower, input and speaker
connections for your particular
installation. Be sure you understand
all the connections before you proceed.
1. Connect the amplifier’s power
ground terminal to the closest point
on the chassis of the car. Keep this
ground wire to less than 39" (100 cm)
in length.Use 4 gauge (or heavier)
wire.
2. Connect the remote terminal to the
remote output of the head unit using
16 gauge (or heavier) wire.
3. Connect an empty fuse holder within
18" (45 cm) of the car battery, and run
4 gauge (or heavier) cable from this
fuse to the amplifier location.
The purpose of placing a fuse in this
locationis to protect your vehicle’s
battery in the event that this wire
accidentally touchesthe chassis
ground on its run to the amplifier.
Connecting the amplifier
4. Check that the fuse holder is empty.
Then connect the fuseholder to the
"BATT+" connection on the amplifier.
5. If multiple amplifiersare being used
in your system, either:
• Run a separate pair of cables from
the battery and a chassis ground point
to each amplifier. Each (+) cable must
have its own inline fuse.
-or-
• Run a #0 cable from the fuse holder
at the battery to a distribution block
at or near the amplifier's location. Then
run separate cables from the amplifier
to this distribution block and to
independent chassis ground points.
6. Connect all line inputs and outputs
(if used) using high-quality cables.
Connect all speakers, following the
diagrams in this manual. Be sure to
observe proper polarity to avoid audio
phase problems.
7. Insert fuse(s) into the battery fuse
holder(s).
8. Recheck all connections before
powering up the amplifier.
9. Set all level controls to minimum
position, and set all crossover
controls/switches to the desired
frequency points.
10. Power up the head unit and the
amplifier. Then set the volume control
on the head unit to about 3/4 volume,
and adjust the amplifier’s input level
control(s) to just below the level of
distortion.
11. Further fine tuning of the various
controls may be necessary to obtain
best results.
Speaker Connections
MASTER
AMPLIFIER
2Introduction
2Features
3What is included?
3General precautions
3Installation precautions
3Mounting the amplifier
4Connecting the amplifier
5Important system considerations
5Tips for a safe system
6Low level input wiring
6Speaker wiring
7Power connections
Normal and with Stiffening Capacitor
8Bridging two Stealth
CLASS D Amplifiers
10 Troubleshooting
11 Specifications
Congratulations on your
purchase of a Sound Storm
Laboratories STEALTH
Class D Amplifier.
It has been designed, engineered
and manufactured to bring you
the highest level of performance
and quality, and will afford you
years of listening pleasure.
Thank you for making Sound
Storm Laboratories your choice
for car audio entertainment!
All specifications subject to
change without notice.
RMS POWER
into 4 Ohms
RMS POWER
into 2 Ohms
MAX POWER
into 2 Ohms
MAX POWER
into 1 Ohm
Min. speaker
impedance
Input
impedance
Input
sensitivity
Frequency response
Signal-to-noise ratio
Crossover/filter range
low pass
subsonic
Bass Boost
Phase Shift
Fuse rating
Dimensions:
(11
-3/4 " x 3" x ...)
1000Wx 1
1200Wx 1
1500Wx 1
2000Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 2
11-3/8"
MODEL
page
STA120
STA135
CLASS D MonoBlock
Car Audio Amplifiers
CLASS D
MonoBlock Car Audio
Amplifier
1400Wx 1
2000Wx 1
2600Wx 1
3500Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 3
12-1/2"
CLASS D
MonoBlock Car Audio
Amplifier
SYMPTOM POSSIBLE REMEDY
STA120 • STA135 Amplifier User’s Manual - page 1
BRIDGED MODE
SWITCH IN MASTER
POSITION
BRIDGED MODE
SWITCH IN SLAVE
POSITION
To Audio Outputs of head
unit or Subwoofer outputs
of a signal processor
To Audio Inputs of
satellite amplifier
(if present)
To Audio Outputs of head unit
or Subwoofer outputs of a
signal processor
Chassis
ground
point

Troubleshooting
STA120 • STA135 Amplifier User’s Manual - page 10
Specifications
STA120 • STA135 Amplifier User’s Manual - page 11
STA120 • STA135 Amplifier User’s Manual - page 6
CONTENTS
U S E R ’ S M A N U A L
STA120 • STA135 Amplifier User’s Manual - page 4
STA120 • STA135 Amplifier User’s Manual - page 3
STA120 • STA135 Amplifier User’s Manual - page 8
STA120 • STA135 Amplifier User’s Manual - page 5
STA120 • STA135 Amplifier User’s Manual - page 7
STA120 • STA135 Amplifier User’s Manual - page 9
STA120 • STA135 Amplifier User’s Manual - page 2
Introduction
Important installation
considerationsfor using
this amplifier.
Notes
If you experience operation or performance problems with this product, compare your
installation with the electrical wiring diagram on the previous pages. If problems persist,
read the following troubleshooting tips which may help eliminate the problems.
Low-level (RCA) input wiring is preferred for best audio performance. Always use
a high-quality RCA cable for best audio performance.
Protection LED
comes on when
amplifier is
powered up.
Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving.
Remote speaker leads, andreset the amplifier. If the Protection LED still
comes on, then the amplifier is faulty and needs servicing.
High hiss in the
speakers.
Disconnect all RCA inputs to the amplifiers. If the hiss disappears,then
plug in the component driving the amplifier and unplug its inputs. If the
hiss disappears at this point, go on until the faulty/noisy component is
found.
It is best to set the amplifier's input level control as low as possible. The
best subjective signal-to-noise ratio is achieved in this manner. Try to set
the head unit as high as possible (without distortion) andthe amp input
level as low as possible.
Squealing noise
from speakers.
Check for improperly grounded RCA interconnects.
Distorted sound.Check that the Input Level Control is set to match the signal level of the
head unit. Always try to set the Input Level as low as possible.
Check thatall crossover frequencies are properly set.
Check for short circuits on the speakerleads.
Amplifier gets
very hot.
Check that the minimum speaker impedance for the amp model is correct.
Check thatthere is good air circulationaroundthe amp. In some
applications, it may be necessary to add andexternal cooling fan.
Engine noise
(static type)
This is usually caused by poor quality RCA cables,which can pick up
radiated noise. Use only the best quality cables, androute them away
from power cables.
Engine noise
(alternator
whine)
Check thatspeaker leads are not shorted to the vehicle chassis.
Check thatthe RCA grounds are not shorted to the vehicle chassis.
Check thatthe head unit is properly grounded.
SHOCK HAZARD! Do not open the case
of thisproduct.There are dangerous
voltages present within the unit. Thereare
no user-serviceable parts within the unit.
Thefuse rating for the amp is 60A
(using two 30A fuses) forthe STA120
and 90A (using three 30A fuses) for
the STA135. Although sufficient for
normal working conditions,
overloading the amp may result in
blown fuses. Please try to avoid
overloading the amp in this manner.
Your Stealth Class D amplifier
is designed to run with a min-
imum load of 1 Ohm.
Operating the STA120 or
STA135 with a speaker imped-
ance load below 1 Ohm may
result in poor sound quality
and damage to the amplifier
circuitry. Such damage is not
covered under the warranty
for this product.
Bridging Two STA120 or Two STA135 Amplifiers
MASTER
AMPLIFIER
SLAVE
AMPLIFIER
When making electrical connections
to the amplifier, please observe the
following:
• Always use 4GAor heavier wire for
power and ground connections.
• Wire the amplifier directly to the car
battery. Makesure there is circuit
protection (such as a fuse) on the
positive power lead within 18” of the
battery.
• When making a ground connection,
always use the shortest possible wire
to a good chassis ground point.
• Wire the remote turn-on connection
to the remote turn-on lead of your EQ
or head unit. In some cases, this may
be the powerantenna lead of the head
unit.
• Fuses protect BOTH the amplifier
and the electrical system of your
vehicle from faulty conditions. If you
must replace a fuse on the amplifier,
you must use a fuse of exactly the
same type and rating.A different type
of fuse or rating may result in damage
or cause a fire.
Tips for making your system
as safe as possible Power Connections
Without Stiffening Capacitor
With Stiffening
Capacitor
Bridging Two STA120 or Two STA135 Amplifiers
SLAVE
AMPLIFIER
INPUT, SPEAKER AND DATALINK CONNECTIONS
(SEE NEXT PAGE FOR POWERCONNECTIONS)
POWER CONNECTIONS
(SEE PREVIOUS PAGE FOR INPUT, SPEAKER AND DATALINK CONNECTIONS)
• If there is smoke or any peculiar odor
present during use or if there is damage
to any of the componentenclosures,
immediately unplug the power cord
and send the amplifier to your local
dealer or service center as soon as
possible .
3. Mark the location for the mounting
hole screws by positioning the amplifier
where you wish to install it. Use a scribe
or mounting screw, inserted through
each of the amp's mounting holes, to
mark the mounting surface. If the
mounting surface is carpeted, measure
the hole centers and mark with a felt
tip pen.
4. Drill pilot holes in the mounting
surface for the mounting screws. Place
the amplifier in position, and attach
the amplifier to the mounting surface
securely using screws.
4. Check that the fuse holder is empty.
Then connect the fuse holder to the
"BATT+" connection on the amplifier.
5. If multiple amplifiers are being used
in your system, either:
• Run a separate pair of cables from
the battery and a chassis ground point
to each amplifier. Each (+) cable must
have its own inline fuse.
-or-
• Run a #0 cable from the fuse holder
at the battery to a distribution block
at or near the amplifier's location. Then
run separate cables from the amplifier
to this distribution block and to
independentchassis ground points.
6. Connectall line inputs and outputs
(if used) using high-quality cables.
Connect all speakers, following the
diagrams in this manual. Be sure to
observe proper polarity to avoid audio
phase problems.
7. Insert fuse(s) into the battery fuse
holder(s).
8. Recheck all connections before
powering up the amplifier.
9. Set all level controls to minimum
position, and set all crossover
controls/switches to the desired
frequency points.
10. Power up the head unit and the
amplifier. Then set the volume control
on the head unit to about 3/4 volume,
and adjust the amplifier’s input level
control(s) to just below the level of
distortion.
11. Further fine tuning of the various
controls may benecessary to obtain
best results.
Speaker Connections
MASTER
AMPLIFIER
2Introduction
2Features
3What is included?
3General precautions
3Installation precautions
3Mounting the amplifier
4Connecting the amplifier
5Important system considerations
5Tips for a safe system
6Low level input wiring
6Speaker wiring
7Power connections
Normal and with Stiffening Capacitor
8Bridging two Stealth
CLASS D Amplifiers
10 Troubleshooting
11 Specifications
Congratulations on your
purchase of a Sound Storm
Laboratories STEALTH
Class D Amplifier.
It has been designed, engineered
and manufactured to bring you
the highest level of performance
and quality, and will afford you
years of listening pleasure.
Thank you for making Sound
Storm Laboratories your choice
for car audio entertainment!
All specifications subject to
change without notice.
RMS POWER
into 4 Ohms
RMS POWER
into 2 Ohms
MAX POWER
into 2 Ohms
MAX POWER
into 1 Ohm
Min. speaker
impedance
Input
impedance
Input
sensitivity
Frequency response
Signal-to-noise ratio
Crossover/filter range
low pass
subsonic
Bass Boost
Phase Shift
Fuse rating
Dimensions:
(11
-3/4
" x 3" x ...)
1000Wx 1
1200Wx 1
1500Wx 1
2000Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 2
11-3/8"
MODEL
page
STA120
STA135
CLASS D MonoBlock
Car Audio Amplifiers
CLASS D
MonoBlock Car Audio
Amplifier
1400Wx 1
2000Wx 1
2600Wx 1
3500Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 3
12-1/2"
CLASS D
MonoBlock Car Audio
Amplifier
SYMPTOM POSSIBLE REMEDY
STA120 • STA135 Amplifier User’s Manual - page 1
Do not mistake the input level control
for a volume control! It is designed
ONLY to match the output level of
your audio source to the input level
of your amplifier.
Do not adjust this input level to
maximum unless your input level
requires it.
Ignoring these instructions will result
in an input overload to the amplifier,
and excessive audio distortion. It
can also cause the protection circuit
to engage.
Don'tmisuse the
level control!
BRIDGED MODE
SWITCH IN MASTER
POSITION
BRIDGED MODE
SWITCH IN SLAVE
POSITION
To Audio Outputs of head
unit or Subwoofer outputs
of a signal processor
To Audio Inputs of
satellite amplifier
(if present)
To Audio Outputs of head unit
or Subwoofer outputs of a
signal processor
Chassis
ground
point

Troubleshooting
STA120 • STA135 Amplifier User’s Manual - page 10
Specifications
STA120 • STA135 Amplifier User’s Manual - page 11
STA120 • STA135 Amplifier User’s Manual - page 6
CONTENTS
U S E R ’ S M A N U A L
STA120 • STA135 Amplifier User’s Manual - page 4
STA120 • STA135 Amplifier User’s Manual - page 3
STA120 • STA135 Amplifier User’s Manual - page 8
STA120 • STA135 Amplifier User’s Manual - page 5
STA120 • STA135 Amplifier User’s Manual - page 7
STA120 • STA135 Amplifier User’s Manual - page 9
STA120 • STA135 Amplifier User’s Manual - page 2
Introduction
Important installation
considerations for using
this amplifier.
Notes
TYPO FIXED,. THIRD SECTION 102207
If you experience operation or performance problems with this product, compare your
installation with the electrical wiring diagram on the previous pages. If problems persist,
read the following troubleshooting tips which may help eliminate the problems.
Low Level InputWiring
Low-level (RCA) input wiring is preferred for best audio performance. Always use
a high-quality RCA cable for best audio performance.
Protection LED
comes on when
amplifier is
powered up.
Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving.
Remove speaker leads, and reset the amplifier. If the Protection LED still
comes on, then the amplifier is faulty and needs servicing.
High hiss in the
speakers.
Disconnect all RCA inputs to the amplifiers. If the hiss disappears,then
plug in the component driving the amplifier and unplug its inputs. If the
hiss disappears at this point, go on until the faulty/noisy component is
found.
It is best to set the amplifier's input level control as low as possible. The
best subjective signal-to-noise ratio is achieved in this manner. Try to set
the head unit as high as possible (without distortion) andthe amp input
level as low as possible.
Squealing noise
from speakers.
Check for improperly grounded RCA interconnects.
Distorted sound.Check that the Input Level Control is set to match the signal level of the
head unit. Always try to set the Input Level as low as possible.
Check thatall crossover frequencies are properly set.
Check for short circuits on the speakerleads.
Amplifier gets
very hot.
Check that the minimum speaker impedance for the amp model is correct.
Check thatthere is good air circulationaroundthe amp. In some
applications, it may be necessary to add andexternal cooling fan.
Engine noise
(static type)
This is usually caused by poor quality RCA cables,which can pick up
radiated noise. Use only the best quality cables, androute them away
from power cables.
Engine noise
(alternator
whine)
Check thatspeaker leads are not shorted to the vehicle chassis.
Check thatthe RCA grounds are not shorted to the vehicle chassis.
Check thatthe head unit is properly grounded.
The fuse rating for the amp is 60A
(using two 30A fuses) for the STA120
and 90A (using three 30A fuses) for
the STA135. Although sufficient for
normal working conditions,
overloading the amp may result in
blown fuses. Please try to avoid
overloading the amp in this manner.
Your Stealth Class D amplifier
is designed to run with a min-
imum load of 1 Ohm.
Operating the STA120 or
STA135 with a speaker imped-
ance load below 1 Ohm may
result in poor sound quality
and damage to the amplifier
circuitry. Such damage is not
covered under the warranty
for this product.
Bridging Two STA120 or Two STA135 Amplifiers
MASTER
AMPLIFIER
SLAVE
AMPLIFIER
Power Connections
Without Stiffening Capacitor
With Stiffening
Capacitor
Bridging Two STA120 or Two STA135 Amplifiers
SLAVE
AMPLIFIER
INPUT, SPEAKER AND DATALINK CONNECTIONS
(SEE NEXT PAGE FOR POWERCONNECTIONS)
POWER CONNECTIONS
(SEE PREVIOUS PAGE FOR INPUT, SPEAKER AND DATALINK CONNECTIONS)
• If there is smoke or any peculiar odor
present during use or if there is damage
to any of the componentenclosures,
immediately unplug the power cord
and send the amplifier to your local
dealer or service center as soon as
possible .
3. Mark the location for the mounting
hole screws by positioning the amplifier
where you wish to install it. Use a scribe
or mounting screw, inserted through
each of the amp's mounting holes, to
mark the mounting surface. If the
mounting surface is carpeted, measure
the hole centers and mark with a felt
tip pen.
4. Drill pilot holes in the mounting
surface for the mounting screws. Place
the amplifier in position, and attach
the amplifier to the mounting surface
securely using screws.
4. Check that the fuse holder is empty.
Then connect the fuse holder to the
"BATT+" connection on the amplifier.
5. If multiple amplifiers are being used
in your system, either:
• Run a separate pair of cables from
the battery and a chassis ground point
to each amplifier. Each (+) cable must
have its own inline fuse.
-or-
• Run a #0 cable from the fuse holder
at the battery to a distribution block
at or near the amplifier's location. Then
run separate cables from the amplifier
to this distribution block and to
independentchassis ground points.
6. Connectall line inputs and outputs
(if used) using high-quality cables.
Connect all speakers, following the
diagrams in this manual. Be sure to
observe proper polarity to avoid audio
phase problems.
7. Insert fuse(s) into the battery fuse
holder(s).
8. Recheck all connections before
powering up the amplifier.
9. Set all level controls to minimum
position, and set all crossover
controls/switches to the desired
frequency points.
10. Power up the head unit and the
amplifier. Then set the volume control
on the head unit to about 3/4 volume,
and adjust the amplifier’s input level
control(s) to just below the level of
distortion.
11. Further fine tuning of the various
controls may benecessary to obtain
best results.
Speaker Connections
MASTER
AMPLIFIER
2Introduction
2Features
3What is included?
3General precautions
3Installation precautions
3Mounting the amplifier
4Connecting the amplifier
5Important system considerations
5Tips for a safe system
6Low level input wiring
6Speaker wiring
7Power connections
Normal and with Stiffening Capacitor
8Bridging two Stealth
CLASS D Amplifiers
10 Troubleshooting
11 Specifications
Congratulations on your
purchase of a Sound Storm
Laboratories STEALTH
Class D Amplifier.
It has been designed, engineered
and manufactured to bring you
the highest level of performance
and quality, and will afford you
years of listening pleasure.
Thank you for making Sound
Storm Laboratories your choice
for car audio entertainment!
All specifications subject to
change without notice.
RMS POWER
into 4 Ohms
RMS POWER
into 2 Ohms
MAX POWER
into 2 Ohms
MAX POWER
into 1 Ohm
Min. speaker
impedance
Input
impedance
Input
sensitivity
Frequency response
Signal-to-noise ratio
Crossover/filter range
low pass
subsonic
Bass Boost
Phase Shift
Fuse rating
Dimensions:
(11
-3/4 " x 2 -7/16 " x ...)
1000Wx 1
1200Wx 1
1500Wx 1
2000Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 2
11-3/8"
MODEL
page
STA120
STA135
CLASS D MonoBlock
Car Audio Amplifiers
CLASS D
MonoBlock Car Audio
Amplifier
1400Wx 1
2000Wx 1
2600Wx 1
3500Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 3
14"
CLASS D
MonoBlock Car Audio
Amplifier
SYMPTOM POSSIBLE REMEDY
STA120 • STA135 Amplifier User’s Manual - page 1
BRIDGED MODE
SWITCH IN MASTER
POSITION
BRIDGED MODE
SWITCH IN SLAVE
POSITION
SPEAKER
IMPEDANCE
1-8 OHMS
To Audio Outputs of head
unit or Subwoofer outputs
of a signal processor
To Audio Inputs of
satellite amplifier
(if present)
To Audio Outputs of head unit
or Subwoofer outputs of a
signal processor
SUBWOOFER
Speaker
Chassis
ground
point
LOWER DR: LINE OUTS AND INPUTS REVERSED 102207 BOTH DR: LINE OUTSAND INPUTSREVERSED 102207

G N DR E M+ 1 2 V
FU S E S
G N DR E M+ 1 2 V
FU S E S
Troubleshooting
STA120 • STA135 Amplifier User’s Manual - page 10
Specifications
STA120 • STA135 Amplifier User’s Manual - page 11
STA120 • STA135 Amplifier User’s Manual - page 6
CONTENTS
U S E R ’ S M A N U A L
STA120 • STA135 Amplifier User’s Manual - page 4
STA120 • STA135 Amplifier User’s Manual - page 3
STA120 • STA135 Amplifier User’s Manual - page 8
STA120 • STA135 Amplifier User’s Manual - page 5
STA120 • STA135 Amplifier User’s Manual - page 7
STA120 • STA135 Amplifier User’s Manual - page 9
STA120 • STA135 Amplifier User’s Manual - page 2
Introduction
Important installation
considerations for using
this amplifier.
Notes
If you experience operation or performance problems with this product, compare your
installation with the electrical wiring diagram on the previous pages. If problems persist,
read the following troubleshooting tips which may help eliminate the problems.
Low-level (RCA) inputwiring is preferred for best audioperformance. Always use
ahigh-quality RCA cable for best audio performance.
Protection LED
comes on when
amplifier is
powered up.
Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving.
Remote speaker leads, andreset the amplifier. If the Protection LED still
comes on, then the amplifier is faulty and needs servicing.
High hiss in the
speakers.
Disconnect all RCA inputs to the amplifiers. If the hiss disappears,then
plug in the component driving the amplifier and unplug its inputs. If the
hiss disappears at this point, go on until the faulty/noisy component is
found.
It is best to set the amplifier's input level control as low as possible. The
best subjective signal-to-noise ratio is achieved in this manner. Try to set
the head unit as high as possible (without distortion) andthe amp input
level as low as possible.
Squealing noise
from speakers.
Check for improperly grounded RCA interconnects.
Distorted sound.Check that the Input Level Control is set to match the signal level of the
head unit. Always try to set the Input Level as low as possible.
Check thatall crossover frequencies are properly set.
Check for short circuits on the speakerleads.
Amplifier gets
very hot.
Check that the minimum speaker impedance for the amp model is correct.
Check thatthere is good air circulationaroundthe amp. In some
applications, it may be necessary to add andexternal cooling fan.
Engine noise
(static type)
This is usually caused by poor quality RCA cables,which can pick up
radiated noise. Use only the best quality cables, androute them away
from power cables.
Engine noise
(alternator
whine)
Check thatspeaker leads are not shorted to the vehicle chassis.
Check thatthe RCA grounds are not shorted to the vehicle chassis.
Check thatthe head unit is properly grounded.
The fuse rating for the amp is 60A
(using two 30A fuses) for the STA120
and 90A (using three 30A fuses) for
the STA135. Although sufficient for
normal working conditions,
overloading the amp may result in
blown fuses. Please try to avoid
overloading the amp in this manner.
Your Stealth Class D amplifier
is designed to run with a min-
imum load of 1 Ohm.
Operating the STA120 or
STA135 with a speaker imped-
ance load below 1 Ohm may
result in poor sound quality
and damage to the amplifier
circuitry. Such damage is not
covered under the warranty
for this product.
Bridging Two STA120 or Two STA135 Amplifiers
MASTER
AMPLIFIER
SLAVE
AMPLIFIER
Power Connections
Without Stiffening Capacitor
With Stiffening
Capacitor
Bridging Two STA120 or Two STA135 Amplifiers
SLAVE
AMPLIFIER
INPUT, SPEAKER AND DATALINK CONNECTIONS
(SEE NEXT PAGE FOR POWERCONNECTIONS)
POWER CONNECTIONS
(SEE PREVIOUS PAGE FOR INPUT, SPEAKER AND DATALINK CONNECTIONS)
• If there is smoke or any peculiar odor
present during use or if there is damage
to any of the componentenclosures,
immediately unplug the power cord
and send the amplifier to your local
dealer or service center as soon as
possible .
3. Mark the location for the mounting
hole screws by positioning the amplifier
where you wish to install it. Use a scribe
or mounting screw, inserted through
each of the amp's mounting holes, to
mark the mounting surface. If the
mounting surface is carpeted, measure
the hole centers and mark with a felt
tip pen.
4. Drill pilot holes in the mounting
surface for the mounting screws. Place
the amplifier in position, and attach
the amplifier to the mounting surface
securely using screws.
4. Check that the fuse holder is empty.
Then connect the fuse holder to the
"BATT+" connection on the amplifier.
5. If multiple amplifiers are being used
in your system, either:
• Run a separate pair of cables from
the battery and a chassis ground point
to each amplifier. Each (+) cable must
have its own inline fuse.
-or-
• Run a #0 cable from the fuse holder
at the battery to a distribution block
at or near the amplifier's location. Then
run separate cables from the amplifier
to this distribution block and to
independentchassis ground points.
6. Connectall line inputs and outputs
(if used) using high-quality cables.
Connect all speakers, following the
diagrams in this manual. Be sure to
observe proper polarity to avoid audio
phase problems.
7. Insert fuse(s) into the battery fuse
holder(s).
8. Recheck all connections before
powering up the amplifier.
9. Set all level controls to minimum
position, and set all crossover
controls/switches to the desired
frequency points.
10. Power up the head unit and the
amplifier. Then set the volume control
on the head unit to about 3/4 volume,
and adjust the amplifier’s input level
control(s) to just below the level of
distortion.
11. Further fine tuning of the various
controls may benecessary to obtain
best results.
Speaker Connections
MASTER
AMPLIFIER
2Introduction
2Features
3What is included?
3General precautions
3Installation precautions
3Mounting the amplifier
4Connecting the amplifier
5Important system considerations
5Tips for a safe system
6Low level input wiring
6Speaker wiring
7Power connections
Normal and with Stiffening Capacitor
8Bridging two Stealth
CLASS D Amplifiers
10 Troubleshooting
11 Specifications
Congratulations on your
purchase of a Sound Storm
Laboratories STEALTH
Class D Amplifier.
It has been designed, engineered
and manufactured to bring you
the highest level of performance
and quality, and will afford you
years of listening pleasure.
Thank you for making Sound
Storm Laboratories your choice
for car audio entertainment!
All specifications subject to
change without notice.
RMS POWER
into 4 Ohms
RMS POWER
into 2 Ohms
MAX POWER
into 2 Ohms
MAX POWER
into 1 Ohm
Min. speaker
impedance
Input
impedance
Input
sensitivity
Frequency response
Signal-to-noise ratio
Crossover/filter range
low pass
subsonic
Bass Boost
Phase Shift
Fuse rating
Dimensions:
(11-3/4" x 3" x ...)
1000Wx 1
1200Wx 1
1500Wx 1
2000Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 2
11-3/8"
MODEL
page
STA120
STA135
CLASS D MonoBlock
Car Audio Amplifiers
CLASS D
MonoBlock Car Audio
Amplifier
1400Wx 1
2000Wx 1
2600Wx 1
3500Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 3
12-1/2"
CLASS D
MonoBlock Car Audio
Amplifier
SYMPTOM POSSIBLE REMEDY
STA120 • STA135 Amplifier User’s Manual - page 1
BRIDGED MODE
SWITCH IN MASTER
POSITION
BRIDGED MODE
SWITCH IN SLAVE
POSITION
To Audio Outputs of head
unit or Subwoofer outputs
of a signal processor
To Audio Inputs of
satellite amplifier
(if present)
to REMOTE TURN-ON
terminal ofhead unit
Chassis ground point
BatteryFUSE
To Audio Outputs of head unit
or Subwoofer outputs of a
signal processor
to REMOTE TURN-ON
terminal of head unit
Battery FUSE
Distribution
Block
Chassis
ground
point
Stiffening
Capacitor
Remote
Subwoofer Level Control
Remote
Subwoofer Level Control
Chassis
ground
point

Troubleshooting
STA120 • STA135 Amplifier User’s Manual - page 10
Specifications
STA120 • STA135 Amplifier User’s Manual - page 11
STA120 • STA135 Amplifier User’s Manual - page 6
CONTENTS
U S E R ’ S M A N U A L
STA120 • STA135 Amplifier User’s Manual - page 4
STA120 • STA135 Amplifier User’s Manual - page 3
STA120 • STA135 Amplifier User’s Manual - page 8
STA120 • STA135 Amplifier User’s Manual - page 5
STA120 • STA135 Amplifier User’s Manual - page 7
STA120 • STA135 Amplifier User’s Manual - page 9
STA120 • STA135 Amplifier User’s Manual - page 2
Introduction
Important installation
considerations for using
this amplifier.
Notes
T Y P O F I X E D , . T H I R D S E C T I O N 1 0 2 2 0 7
If you experience operation or performance problems with this product, compare your
installation with the electrical wiring diagram on the previous pages. If problems persist,
read the following troubleshooting tips which may help eliminate the problems.
Low-level (RCA) inputwiring is preferred for best audioperformance. Always use
ahigh-quality RCA cable for best audio performance.
Protection LED
comes on when
amplifier is
powered up.
Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving.
Remove speaker leads, and reset the amplifier. If the Protection LED still
comes on, then the amplifier is faulty and needs servicing.
High hiss in the
speakers.
Disconnect all RCA inputs to the amplifiers. If the hiss disappears,then
plug in the component driving the amplifier and unplug its inputs. If the
hiss disappears at this point, go on until the faulty/noisy component is
found.
It is best to set the amplifier's input level control as low as possible. The
best subjective signal-to-noise ratio is achieved in this manner. Try to set
the head unit as high as possible (without distortion) andthe amp input
level as low as possible.
Squealing noise
from speakers.
Check for improperly grounded RCA interconnects.
Distorted sound.Check that the Input Level Control is set to match the signal level of the
head unit. Always try to set the Input Level as low as possible.
Check thatall crossover frequencies are properly set.
Check for short circuits on the speakerleads.
Amplifier gets
very hot.
Check that the minimum speaker impedance for the amp model is correct.
Check thatthere is good air circulationaroundthe amp. In some
applications, it may be necessary to add andexternal cooling fan.
Engine noise
(static type)
This is usually caused by poor quality RCA cables,which can pick up
radiated noise. Use only the best quality cables, androute them away
from power cables.
Engine noise
(alternator
whine)
Check thatspeaker leads are not shorted to the vehicle chassis.
Check thatthe RCA grounds are not shorted to the vehicle chassis.
Check thatthe head unit is properly grounded.
The fuse rating for the amp is 60A
(using two 30A fuses) for the STA120
and 90A (using three 30A fuses) for
the STA135. Although sufficient for
normal working conditions,
overloading the amp may result in
blown fuses. Please try to avoid
overloading the amp in this manner.
Your Stealth Class D amplifier
is designed to run with a min-
imum load of 1 Ohm.
Operating the STA120 or
STA135 with a speaker imped-
ance load below 1 Ohm may
result in poor sound quality
and damage to the amplifier
circuitry. Such damage is not
covered under the warranty
for this product.
Bridging Two STA120 or Two STA135 Amplifiers
MASTER
AMPLIFIER
SLAVE
AMPLIFIER
Power Connections
Without Stiffening Capacitor
With Stiffening
Capacitor
Bridging Two STA120 or Two STA135 Amplifiers
SLAVE
AMPLIFIER
INPUT, SPEAKER AND DATALINK CONNECTIONS
(SEE NEXT PAGE FOR POWERCONNECTIONS)
POWER CONNECTIONS
(SEE PREVIOUS PAGE FOR INPUT, SPEAKER AND DATALINK CONNECTIONS)
• If there is smoke or any peculiar odor
present during use or if there is damage
to any of the componentenclosures,
immediately unplug the power cord
and send the amplifier to your local
dealer or service center as soon as
possible .
3. Mark the location for the mounting
hole screws by positioning the amplifier
where you wish to install it. Use a scribe
or mounting screw, inserted through
each of the amp's mounting holes, to
mark the mounting surface. If the
mounting surface is carpeted, measure
the hole centers and mark with a felt
tip pen.
4. Drill pilot holes in the mounting
surface for the mounting screws. Place
the amplifier in position, and attach
the amplifier to the mounting surface
securely using screws.
4. Check that the fuse holder is empty.
Then connect the fuse holder to the
"BATT+" connection on the amplifier.
5. If multiple amplifiers are being used
in your system, either:
• Run a separate pair of cables from
the battery and a chassis ground point
to each amplifier. Each (+) cable must
have its own inline fuse.
-or-
• Run a #0 cable from the fuse holder
at the battery to a distribution block
at or near the amplifier's location. Then
run separate cables from the amplifier
to this distribution block and to
independentchassis ground points.
6. Connectall line inputs and outputs
(if used) using high-quality cables.
Connect all speakers, following the
diagrams in this manual. Be sure to
observe proper polarity to avoid audio
phase problems.
7. Insert fuse(s) into the battery fuse
holder(s).
8. Recheck all connections before
powering up the amplifier.
9. Set all level controls to minimum
position, and set all crossover
controls/switches to the desired
frequency points.
10. Power up the head unit and the
amplifier. Then set the volume control
on the head unit to about 3/4 volume,
and adjust the amplifier’s input level
control(s) to just below the level of
distortion.
11. Further fine tuning of the various
controls may benecessary to obtain
best results.
Speaker Connections
MASTER
AMPLIFIER
2Introduction
2Features
3What is included?
3General precautions
3Installation precautions
3Mounting the amplifier
4Connecting the amplifier
5Important system considerations
5Tips for a safe system
6Low level input wiring
6Speaker wiring
7Power connections
Normal and with Stiffening Capacitor
8Bridging two Stealth
CLASS D Amplifiers
10 Troubleshooting
11 Specifications
Congratulations on your
purchase of a Sound Storm
Laboratories STEALTH
Class D Amplifier.
It has been designed, engineered
and manufactured to bring you
the highest level of performance
and quality, and will afford you
years of listening pleasure.
Thank you for making Sound
Storm Laboratories your choice
for car audio entertainment!
All specifications subject to
change without notice.
RMS POWER
into 4 Ohms
RMS POWER
into 2 Ohms
MAX POWER
into 2 Ohms
MAX POWER
into 1 Ohm
Min. speaker
impedance
Input
impedance
Input
sensitivity
Frequency response
Signal-to-noise ratio
Crossover/filter range
low pass
subsonic
Bass Boost
Phase Shift
Fuse rating
Dimensions:
(11
-3/4 " x 2 -7/16 " x ...)
1000Wx 1
1200Wx 1
1500Wx 1
2000Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 2
11-3/8"
MODEL
page
STA120
STA135
CLASS D MonoBlock
Car Audio Amplifiers
CLASS D
MonoBlock Car Audio
Amplifier
1400Wx 1
2000Wx 1
2600Wx 1
3500Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 3
14"
CLASS D
MonoBlock Car Audio
Amplifier
SYMPTOM POSSIBLE REMEDY
STA120 • STA135 Amplifier User’s Manual - page 1
SUBWOOFER
Speaker
+
–
SPEAKER
IMPEDANCE
2-8 OHMS
BRIDGED MODE
SWITCH IN MASTER
POSITION
BRIDGED MODE
SWITCH IN SLAVE
POSITION
To Audio Outputs of head
unit or Subwoofer outputs
of a signal processor
To Audio Inputs of
satellite amplifier
(if present)
To Audio Outputs of head unit
or Subwoofer outputs of a
signal processor
PLEASENOTE:
In this MASTER AMP/SLAVE AMP configuration, the Slave amp
receives its audio signal from the Master Amp. Therefore, DO NOT
USETHE INPUTS ON THE SLAVE AMP!
Chassis
ground
point
LOWER DR: LINE OUTS AND INPUTS REVERSED 102207BOTH DR: LINE OUTSAND INPUTSREVERSED 102207

G N DR E M+ 1 2 V
FU S E S
G N DRE M+ 1 2 V
FU S E S
Troubleshooting
STA120 • STA135 Amplifier User’s Manual - page 10
Specifications
STA120 • STA135 Amplifier User’s Manual - page 11
STA120 • STA135 Amplifier User’s Manual - page 6
CONTENTS
U S E R ’ S M A N U A L
STA120 • STA135 Amplifier User’s Manual - page 4
STA120 • STA135 Amplifier User’s Manual - page 3
STA120 • STA135 Amplifier User’s Manual - page 8
STA120 • STA135 Amplifier User’s Manual - page 5
STA120 • STA135 Amplifier User’s Manual - page 7
STA120 • STA135 Amplifier User’s Manual - page 9
STA120 • STA135 Amplifier User’s Manual - page 2
Introduction
Important installation
considerations for using
this amplifier.
Notes
TYPO FIXED,. THIRD SECTION 102207
If you experience operation or performance problems with this product, compare your
installation with the electrical wiring diagram on the previous pages. If problems persist,
read the following troubleshooting tips which may help eliminate the problems.
Low-level (RCA) inputwiring is preferred for best audioperformance. Always use
ahigh-quality RCA cable for best audio performance.
Protection LED
comes on when
amplifier is
powered up.
Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving.
Remove speaker leads, and reset the amplifier. If the Protection LED still
comes on, then the amplifier is faulty and needs servicing.
High hiss in the
speakers.
Disconnect all RCA inputs to the amplifiers. If the hiss disappears,then
plug in the component driving the amplifier and unplug its inputs. If the
hiss disappears at this point, go on until the faulty/noisy component is
found.
It is best to set the amplifier's input level control as low as possible. The
best subjective signal-to-noise ratio is achieved in this manner. Try to set
the head unit as high as possible (without distortion) andthe amp input
level as low as possible.
Squealing noise
from speakers.
Check for improperly grounded RCA interconnects.
Distorted sound.Check that the Input Level Control is set to match the signal level of the
head unit. Always try to set the Input Level as low as possible.
Check thatall crossover frequencies are properly set.
Check for short circuits on the speakerleads.
Amplifier gets
very hot.
Check that the minimum speaker impedance for the amp model is correct.
Check thatthere is good air circulationaroundthe amp. In some
applications, it may be necessary to add andexternal cooling fan.
Engine noise
(static type)
This is usually caused by poor quality RCA cables,which can pick up
radiated noise. Use only the best quality cables, androute them away
from power cables.
Engine noise
(alternator
whine)
Check thatspeaker leads are not shorted to the vehicle chassis.
Check thatthe RCA grounds are not shorted to the vehicle chassis.
Check thatthe head unit is properly grounded.
The fuse rating for the amp is 60A
(using two 30A fuses) for the STA120
and 90A (using three 30A fuses) for
the STA135. Although sufficient for
normal working conditions,
overloading the amp may result in
blown fuses. Please try to avoid
overloading the amp in this manner.
Your Stealth Class D amplifier
is designed to run with a min-
imum load of 1 Ohm.
Operating the STA120 or
STA135 with a speaker imped-
ance load below 1 Ohm may
result in poor sound quality
and damage to the amplifier
circuitry. Such damage is not
covered under the warranty
for this product.
Bridging Two STA120 or Two STA135 Amplifiers
MASTER
AMPLIFIER
SLAVE
AMPLIFIER
Power Connections
Without Stiffening Capacitor
With Stiffening
Capacitor
Bridging Two STA120 or Two STA135 Amplifiers
SLAVE
AMPLIFIER
INPUT, SPEAKER AND DATALINK CONNECTIONS
(SEE NEXT PAGE FOR POWER CONNECTIONS)
POWER CONNECTIONS
(SEE PREVIOUS PAGE FOR INPUT, SPEAKER AND DATALINK CONNECTIONS)
• If there is smoke or any peculiar odor
present during use or if there is damage
to any of the componentenclosures,
immediately unplug the power cord
and send the amplifier to your local
dealer or service center as soon as
possible .
3. Mark the location for the mounting
hole screws by positioning the amplifier
where you wish to install it. Use a scribe
or mounting screw, inserted through
each of the amp's mounting holes, to
mark the mounting surface. If the
mounting surface is carpeted, measure
the hole centers and mark with a felt
tip pen.
4. Drill pilot holes in the mounting
surface for the mounting screws. Place
the amplifier in position, and attach
the amplifier to the mounting surface
securely using screws.
4. Check that the fuse holder is empty.
Then connect the fuse holder to the
"BATT+" connection on the amplifier.
5. If multiple amplifiers are being used
in your system, either:
• Run a separate pair of cables from
the battery and a chassis ground point
to each amplifier. Each (+) cable must
have its own inline fuse.
-or-
• Run a #0 cable from the fuse holder
at the battery to a distribution block
at or near the amplifier's location. Then
run separate cables from the amplifier
to this distribution block and to
independentchassis ground points.
6. Connectall line inputs and outputs
(if used) using high-quality cables.
Connect all speakers, following the
diagrams in this manual. Be sure to
observe proper polarity to avoid audio
phase problems.
7. Insert fuse(s) into the battery fuse
holder(s).
8. Recheck all connections before
powering up the amplifier.
9. Set all level controls to minimum
position, and set all crossover
controls/switches to the desired
frequency points.
10. Power up the head unit and the
amplifier. Then set the volume control
on the head unit to about 3/4 volume,
and adjust the amplifier’s input level
control(s) to just below the level of
distortion.
11. Further fine tuning of the various
controls may benecessary to obtain
best results.
Speaker Connections
MASTER
AMPLIFIER
2Introduction
2Features
3What is included?
3General precautions
3Installation precautions
3Mounting the amplifier
4Connecting the amplifier
5Important system considerations
5Tips for a safe system
6Low level input wiring
6Speaker wiring
7Power connections
Normal and with Stiffening Capacitor
8Bridging two Stealth
CLASS D Amplifiers
10 Troubleshooting
11 Specifications
Congratulations on your
purchase of a Sound Storm
Laboratories STEALTH
Class D Amplifier.
It has been designed, engineered
and manufactured to bring you
the highest level of performance
and quality, and will afford you
years of listening pleasure.
Thank you for making Sound
Storm Laboratories your choice
for car audio entertainment!
All specifications subject to
change without notice.
RMS POWER
into 4 Ohms
RMS POWER
into 2 Ohms
MAX POWER
into 2 Ohms
MAX POWER
into 1 Ohm
Min. speaker
impedance
Input
impedance
Input
sensitivity
Frequency response
Signal-to-noise ratio
Crossover/filter range
low pass
subsonic
Bass Boost
Phase Shift
Fuse rating
Dimensions:
(11-3/4" x 3" x ...)
1000Wx 1
1200Wx 1
1500Wx 1
2000Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 2
11-3/8"
MODEL
page
STA120
STA135
CLASS D MonoBlock
Car Audio Amplifiers
CLASS D
MonoBlock Car Audio
Amplifier
1400Wx 1
2000Wx 1
2600Wx 1
3500Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 3
14"
CLASS D
MonoBlock Car Audio
Amplifier
SYMPTOM POSSIBLE REMEDY
STA120 • STA135 Amplifier User’s Manual - page 1
BRIDGED MODE
SWITCH IN MASTER
POSITION
BRIDGED MODE
SWITCH IN SLAVE
POSITION
To Audio Outputs of head
unit or Subwoofer outputs
of a signal processor
To Audio Inputs of
satellite amplifier
(if present)
To Audio Outputs of head unit
or Subwoofer outputs of a
signal processor
to REMOTE TURN-ON
terminal of head unit
Chassis
ground
point
Battery FUSE
Distribution
Block
Chassis
ground
point
Stiffening
Capacitor
Chassis
ground
point
Remote Subwoofer
Level Control
PLEASE NOTE:
In this MASTER AMP/SLAVE AMP
configuration, the Slave amp receives
its audio signal from the Master Amp.
Therefore, DO NOT USE THE REMOTE
SUBWOOFER LEVEL CONTROL ON
THE SLAVE AMP!
Chassis
ground
point
LOWER DR: LINE OUTS AND INPUTS REVERSED 102207BOTH DR: LINE OUTS AND INPUTS REVERSED 102207

Troubleshooting
STA120 • STA135 Amplifier User’s Manual - page 10
Specifications
STA120 • STA135 Amplifier User’s Manual - page 11
STA120 • STA135 Amplifier User’s Manual - page 6
CONTENTS
U S E R ’ S M A N U A L
STA120 • STA135 Amplifier User’s Manual - page 4
STA120 • STA135 Amplifier User’s Manual - page 3
STA120 • STA135 Amplifier User’s Manual - page 8
STA120 • STA135 Amplifier User’s Manual - page 5
STA120 • STA135 Amplifier User’s Manual - page 7
STA120 • STA135 Amplifier User’s Manual - page 9
STA120 • STA135 Amplifier User’s Manual - page 2
Introduction
Important installation
considerations for using
this amplifier.
Notes
TYPO FIXED,. THIRD SECTION 102207
If you experience operation or performance problems with this product, compare your
installation with the electrical wiring diagram on the previous pages. If problems persist,
read the following troubleshooting tips which may help eliminate the problems.
Amplifier will not
power up.
Check to makesure you have a good ground connection.
Check thatthe Remote Input (Turn-On) has at least 3VDC.
Check thatthere is battery power on the (+) terminal.
Check thatthere is at least 12v.
Check all fuses, replace if necessary.
Make sure that the Protection LED is not illuminated. If it is lit, shut off
the amplifier briefly, and then repower it.
Low-level (RCA) inputwiring is preferred for best audioperformance. Always use
ahigh-quality RCA cable for best audio performance.
Protection LED
comes on when
amplifier is
powered up.
Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving.
Remove speaker leads, and reset the amplifier. If the Protection LED still
comes on, then the amplifier is faulty and needs servicing.
No output. Check thatall fuses are OK.
Check thatamplifier is properly grounded.
Check thatthe Remote Input (Turn-On) has at least 3VDC.
Check thatthe RCA audio cables are plugged into the proper inputs.
Check all speaker wiring.
Lowoutput. Reset the Level Control.
Check the Crossover Control settings.
Audio present in
only one channel.
Check the RCA interconnect cables.
Check all speaker wiring.
High hiss in the
speakers.
Disconnect all RCA inputs to the amplifiers. If the hiss disappears,then
plug in the component driving the amplifier and unplug its inputs. If the
hiss disappears at this point, go on until the faulty/noisy component is
found.
It is best to set the amplifier's input level control as low as possible. The
best subjective signal-to-noise ratio is achieved in this manner. Try to set
the head unit as high as possible (without distortion) andthe amp input
level as low as possible.
Squealing noise
from speakers.
Check for improperly grounded RCA interconnects.
Distorted sound.Check that the Input Level Control is set to match the signal level of the
head unit. Always try to set the Input Level as low as possible.
Check thatall crossover frequencies are properly set.
Check for short circuits on the speakerleads.
Amplifier gets
very hot.
Check that the minimum speaker impedance for the amp model is correct.
Check thatthere is good air circulationaroundthe amp. In some
applications, it may be necessary to add andexternal cooling fan.
Engine noise
(static type)
This is usually caused by poor quality RCA cables,which can pick up
radiated noise. Use only the best quality cables, androute them away
from power cables.
Engine noise
(alternator
whine)
Check thatspeaker leads are not shorted to the vehicle chassis.
Check thatthe RCA grounds are not shorted to the vehicle chassis.
Check thatthe head unit is properly grounded.
The fuse rating for the amp is 60A
(using two 30A fuses) for the STA120
and 90A (using three 30A fuses) for
the STA135. Although sufficient for
normal working conditions,
overloading the amp may result in
blown fuses. Please try to avoid
overloading the amp in this manner.
Your Stealth Class D amplifier
is designed to run with a min-
imum load of 1 Ohm.
Operating the STA120 or
STA135 with a speaker imped-
ance load below 1 Ohm may
result in poor sound quality
and damage to the amplifier
circuitry. Such damage is not
covered under the warranty
for this product.
Bridging Two STA120 or Two STA135 Amplifiers
MASTER
AMPLIFIER
SLAVE
AMPLIFIER
Power Connections
Without Stiffening Capacitor
With Stiffening
Capacitor
Bridging Two STA120 or Two STA135 Amplifiers
SLAVE
AMPLIFIER
INPUT, SPEAKER AND DATALINK CONNECTIONS
(SEE NEXT PAGE FOR POWER CONNECTIONS)
POWER CONNECTIONS
(SEE PREVIOUS PAGE FOR INPUT, SPEAKER AND DATALINK CONNECTIONS)
• If there is smoke or any peculiar odor
present during use or if there is damage
to any of the componentenclosures,
immediately unplug the power cord
and send the amplifier to your local
dealer or service center as soon as
possible .
3. Mark the location for the mounting
hole screws by positioning the amplifier
where you wish to install it. Use a scribe
or mounting screw, inserted through
each of the amp's mounting holes, to
mark the mounting surface. If the
mounting surface is carpeted, measure
the hole centers and mark with a felt
tip pen.
4. Drill pilot holes in the mounting
surface for the mounting screws. Place
the amplifier in position, and attach
the amplifier to the mounting surface
securely using screws.
4. Check that the fuse holder is empty.
Then connect the fuse holder to the
"BATT+" connection on the amplifier.
5. If multiple amplifiers are being used
in your system, either:
• Run a separate pair of cables from
the battery and a chassis ground point
to each amplifier. Each (+) cable must
have its own inline fuse.
-or-
• Run a #0 cable from the fuse holder
at the battery to a distribution block
at or near the amplifier's location. Then
run separate cables from the amplifier
to this distribution block and to
independentchassis ground points.
6. Connectall line inputs and outputs
(if used) using high-quality cables.
Connect all speakers, following the
diagrams in this manual. Be sure to
observe proper polarity to avoid audio
phase problems.
7. Insert fuse(s) into the battery fuse
holder(s).
8. Recheck all connections before
powering up the amplifier.
9. Set all level controls to minimum
position, and set all crossover
controls/switches to the desired
frequency points.
10. Power up the head unit and the
amplifier. Then set the volume control
on the head unit to about 3/4 volume,
and adjust the amplifier’s input level
control(s) to just below the level of
distortion.
11. Further fine tuning of the various
controls may benecessary to obtain
best results.
Speaker Connections
MASTER
AMPLIFIER
2Introduction
2Features
3What is included?
3General precautions
3Installation precautions
3Mounting the amplifier
4Connecting the amplifier
5Important system considerations
5Tips for a safe system
6Low level input wiring
6Speaker wiring
7Power connections
Normal and with Stiffening Capacitor
8Bridging two Stealth
CLASS D Amplifiers
10 Troubleshooting
11 Specifications
Congratulations on your
purchase of a Sound Storm
Laboratories STEALTH
Class D Amplifier.
It has been designed, engineered
and manufactured to bring you
the highest level of performance
and quality, and will afford you
years of listening pleasure.
Thank you for making Sound
Storm Laboratories your choice
for car audio entertainment!
All specifications subject to
change without notice.
RMS POWER
into 4 Ohms
RMS POWER
into 2 Ohms
MAX POWER
into 2 Ohms
MAX POWER
into 1 Ohm
Min. speaker
impedance
Input
impedance
Input
sensitivity
Frequency response
Signal-to-noise ratio
Crossover/filter range
low pass
subsonic
Bass Boost
Phase Shift
Fuse rating
Dimensions:
(11
-3/4
" x 3" x ...)
1000Wx 1
1200Wx 1
1500Wx 1
2000Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 2
11-3/8"
MODEL
page
STA120
STA135
CLASS D MonoBlock
Car Audio Amplifiers
CLASS D
MonoBlock Car Audio
Amplifier
1400Wx 1
2000Wx 1
2600Wx 1
3500Wx 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 3
14"
CLASS D
MonoBlock Car Audio
Amplifier
SYMPTOM POSSIBLE REMEDY
STA120 • STA135 Amplifier User’s Manual - page 1
BRIDGED MODE
SWITCH IN MASTER
POSITION
BRIDGED MODE
SWITCH IN SLAVE
POSITION
To Audio Outputs of head
unit or Subwoofer outputs
of a signal processor
To Audio Inputs of
satellite amplifier
(if present)
To Audio Outputs of head unit
or Subwoofer outputs of a
signal processor
Chassis
ground
point
LOWER DR: LINE OUTS AND INPUTS REVERSED 102207BOTH DR: LINE OUTS AND INPUTS REVERSED 102207

Troubleshooting
STA120 • STA135 Amplifier User’s Manual - page 10
Specifications
STA120 • STA135 Amplifier User’s Manual - page 11
STA120 • STA135 Amplifier User’s Manual - page 6
CONTENTS
U S E R ’ S M A N U A L
STA120 • STA135 Amplifier User’s Manual - page 4
STA120 • STA135 Amplifier User’s Manual - page 3
STA120 • STA135 Amplifier User’s Manual - page 8
STA120 • STA135 Amplifier User’s Manual - page 5
STA120 • STA135 Amplifier User’s Manual - page 7
STA120 • STA135 Amplifier User’s Manual - page 9
STA120 • STA135 Amplifier User’s Manual - page 2
Introduction
Important installation
considerations for using
this amplifier.
Notes
If you experience operation or performance problems with this product, compare your
installation with the electrical wiring diagram on the previous pages. If problems persist,
read the following troubleshooting tips which may help eliminate the problems.
Low-level (RCA) inputwiring is preferred for best audioperformance. Always use
ahigh-quality RCA cable for best audio performance.
Protection LED
comes on when
amplifier is
powered up.
Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving.
Remote speaker leads, and reset the amplifier. If the Protection LED still
comes on, then the amplifier is faulty and needs servicing.
High hiss in the
speakers.
Disconnect all RCA inputs to the amplifiers. If the hiss disappears, then
plug in the component driving the amplifier and unplug its inputs. If the
hiss disappears at this point, go on until the faulty/noisy component is
found.
It is best to set the amplifier's input level control as low as possible. The
best subjective signal-to-noise ratio is achieved in this manner. Try to set
the head unit as high as possible (without distortion) and the amp input
level as low as possible.
Squealing noise
from speakers.
Check for improperly grounded RCA interconnects.
Distorted sound. Check that the Input Level Control is set to match the signal level of the
head unit. Always try to set the Input Level as low as possible.
Check that all crossover frequencies are properly set.
Check for short circuits on the speaker leads.
Amplifier gets
very hot.
Check that the minimum speaker impedance for the amp model is correct.
Check that there is good air circulation around the amp. In some
applications, it may be necessary to add and external cooling fan.
Engine noise
(static type)
This is usually caused by poor quality RCA cables,which can pick up
radiated noise. Use only the best quality cables, and route them away
from power cables.
Engine noise
(alternator
whine)
Check that speaker leads are not shorted to the vehicle chassis.
Check that the RCA grounds are not shorted to the vehicle chassis.
Check that the head unit is properly grounded.
The fuse rating for the amp is 60A
(using two 30A fuses) for the STA120
and 90A (using three 30A fuses) for
the STA135. Although sufficient for
normal working conditions,
overloading the amp may result in
blown fuses. Please try to avoid
overloading the amp in this manner.
Your Stealth Class D amplifier
is designed to run with a min-
imum load of 1 Ohm.
Operating the STA120 or
STA135 with a speaker imped-
ance load below 1 Ohm may
result in poor sound quality
and damage to the amplifier
circuitry. Such damage is not
covered under the warranty
for this product.
Bridging Two STA120 or Two STA135 Amplifiers
MASTER
AMPLIFIER
SLAVE
AMPLIFIER
Power Connections
Without Stiffening Capacitor
With Stiffening
Capacitor
Bridging Two STA120 or Two STA135 Amplifiers
SLAVE
AMPLIFIER
INPUT, SPEAKER AND DATALINK CONNECTIONS
(SEE NEXT PAGE FOR POWER CONNECTIONS)
POWER CONNECTIONS
(SEE PREVIOUS PAGE FOR INPUT, SPEAKER AND DATALINK CONNECTIONS)
• If there is smoke or any peculiar odor
present during use or if there is damage
to any of the componentenclosures,
immediately unplug the power cord
and send the amplifier to your local
dealer or service center as soon as
possible .
3. Mark the location for the mounting
hole screws by positioning the amplifier
where you wish to install it. Use a scribe
or mounting screw, inserted through
each of the amp's mounting holes, to
mark the mounting surface. If the
mounting surface is carpeted, measure
the hole centers and mark with a felt
tip pen.
4. Drill pilot holes in the mounting
surface for the mounting screws. Place
the amplifier in position, and attach
the amplifier to the mounting surface
securely using screws.
4. Check that the fuse holder is empty.
Then connect the fuse holder to the
"BATT+" connection on the amplifier.
5. If multiple amplifiers are being used
in your system, either:
• Run a separate pair of cables from
the battery and a chassis ground point
to each amplifier. Each (+) cable must
have its own inline fuse.
-or-
• Run a #0 cable from the fuse holder
at the battery to a distribution block
at or near the amplifier's location. Then
run separate cables from the amplifier
to this distribution block and to
independentchassis ground points.
6. Connectall line inputs and outputs
(if used) using high-quality cables.
Connect all speakers, following the
diagrams in this manual. Be sure to
observe proper polarity to avoid audio
phase problems.
7. Insert fuse(s) into the battery fuse
holder(s).
8. Recheck all connections before
powering up the amplifier.
9. Set all level controls to minimum
position, and set all crossover
controls/switches to the desired
frequency points.
10. Power up the head unit and the
amplifier. Then set the volume control
on the head unit to about 3/4 volume,
and adjust the amplifier’s input level
control(s) to just below the level of
distortion.
11. Further fine tuning of the various
controls may benecessary to obtain
best results.
Speaker Connections
MASTER
AMPLIFIER
2Introduction
2Features
3What is included?
3General precautions
3Installation precautions
3Mounting the amplifier
4Connecting the amplifier
5Important system considerations
5Tips for a safe system
6Low level input wiring
6Speaker wiring
7Power connections
Normal and with Stiffening Capacitor
8Bridging two Stealth
CLASS D Amplifiers
10 Troubleshooting
11 Specifications
Congratulations on your
purchase of a Sound Storm
Laboratories STEALTH
Class D Amplifier.
It has been designed, engineered
and manufactured to bring you
the highest level of performance
and quality, and will afford you
years of listening pleasure.
Thank you for making Sound
Storm Laboratories your choice
for car audio entertainment!
All specifications subject to
change without notice.
RMS POWER
into 4 Ohms
RMS POWER
into 2 Ohms
MAX POWER
into 2 Ohms
MAX POWER
into 1 Ohm
Min. speaker
impedance
Input
impedance
Input
sensitivity
Frequency response
Signal-to-noise ratio
Crossover/filter range
low pass
subsonic
Bass Boost
Phase Shift
Fuse rating
Dimensions:
(11-3/4" x 3" x ...)
1000W x 1
1200W x 1
1500W x 1
2000W x 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 2
11-3/8"
MODEL
page
STA120
STA135
CLASS D MonoBlock
Car Audio Amplifiers
CLAS S D
Mono Bloc k CarAudio
Ampli fie r
1400W x 1
2000W x 1
2600W x 1
3500W x 1
1 Ohm Mono
10k Ohm
Selectable 100mV-2V or 2V-8V
50Hz-150Hz
100dB
50Hz-150Hz
15Hz-40Hz
Variable 0 -+18dB
Selectable 0/180º
30A x 3
12-1/2"
CLAS S D
Mono Bloc k CarAudio
Ampli fie r
SYMPTOM POSSIBLE REMEDY
STA120 • STA135 Amplifier User’s Manual - page 1
BRIDGED MODE
SWITCH IN MASTER
POSITION
BRIDGED MODE
SWITCH IN SLAVE
POSITION
To Audio Outputs of head
unit or Subwoofer outputs
of a signal processor
To Audio Inputs of
satellite amplifier
(if present)
To Audio Outputs of head unit
or Subwoofer outputs of a
signal processor
Chassis
ground
point