Audiophile Systems PHD2050 Troubleshooting guide

Audiophile Sound Systems
Owner's Manual
Installation Guide
&
PHD2050
PHD2200
PHD4050
PHD4075
PHD11000

-1-
NOTE : Specifications & design subject to change without notice for improvements.
SPECIFICATION
AMPLIFIER
2 Ohm RMS Output
4 Ohm RMS Output
Low Pass Filter (Variable)
High Pass Filter (Variable)
Subsonic Filter
Fuse Rating
Frequency Response (-1dB)
Signal To Noise Ratio ('A' WTD)
Input Sensitivity
Input Impedance
Operation Voltage (negative Ground)
Speaker Impedance @ Stereo Driven
Dimensions (250 X 54 X D)mm 200
60W x 2
90W x 2
50Hz-250Hz
80Hz-1.2kHz
20Hz-50Hz
25 A x 1
10Hz-30kHz
>100dB
200mV-6V
22k Ohm
DC 12V
4 Ohm
420
210W x 2
300W x 2
50Hz-250Hz
80Hz-1.2kHz
20Hz-50Hz
30 A x 3
10Hz-30kHz
>100dB
200mV-6V
22k Ohm
DC 12V
4 Ohm
280
60W x 4
90W x 4
50Hz-250Hz
80Hz-1.2kHz
N/A
40 A x 1
10Hz-30kHz
>100dB
200mV-6V
22k Ohm
DC 12V
4 Ohm
PHD2050
4 Ohm Bridge Output 180W x 1 600W x 1 180W x 2
PHD2200 PHD4050
Audiophile Sound Systems

-2-
NOTE : Specifications & design subject to change without notice for improvements.
SPECIFICATION
AMPLIFIER
2 Ohm RMS Output
1 Ohm RMS Output
4 Ohm RMS Output
Low Pass Filter (Variable)
High Pass Filter (Variable)
Subsonic Filter
Phase
Fuse Rating
Frequency Response (-1dB)
Signal To Noise Ratio ('A' WTD)
Input Sensitivity
Input Impedance
Operation Voltage (negative Ground)
Speaker Impedance @ Stereo Driven
Dimensions (250 X 54 X D)mm 350
350W x 1
670W x 1
1100W x 1
50Hz-250Hz
N/A
15Hz-50Hz
0 - 180
30 A x 3
15Hz-200Hz
>100dB
200mV-6V
22k Ohm
DC 12V
4 Ohm
4 Ohm Bridge Output
PHD11000
Audiophile Sound Systems
380
80W x 4
110W x 4
N/A
50Hz-250Hz
80Hz-1.2kHz
N/A
N/A
30 A x 2
10Hz-30kHz
>100dB
200mV-6V
22k Ohm
DC 12V
4 Ohm
220W x 2
PHD4075
N/A

-3-
free installation.
Congratulations on your Purchase
Four Class ''AB'' High-Current
Dual Discrete Drive Stages.
Class ''AB'' Technology
MOSFET PWM Power Supply.
Bridgeable & TRI-Mode Operation.
Continuously Variable 12dB/Octave High Pass
& 12dB /Octave Low Pass Crossover.
Subwoofer Variable Crossover for
Deep Bass Control.
Enhanced Bass Boost +12dB @ 50Hz.
Silver Plated RCA, Power & Speaker Terminal.
Soft Start & Muting.
DC, Thermal and Short Circuit Protection.
Power & Protection indicator.
Features
Your new high fidelity bridgeable/stereo amplifier is designed to deliver maximum enjoy
-ment and one year of trouble free service. Please take a few moments to read this manual
thoroughly. It will explain the features and operation of your unit and help insure trouble
Precautions: Read First!
authorized installer. It's your car!
If after reading the directions you feel uncomfortable about installing the amplifier in your
car, or not equipped or competent to do so, you should have the amplifier installed by an
Negative battery terminal must be disconnected before any electrical connections are made.
Be sure choose a location that provides substantial ventilation for the amplifier. The most
preferred locations would be in your car's trunk, under the front seats or on the back wall
of a truck.
The location chosen should provide at least 2" of clearance above the amplifier for adequate
ventilation.
If the amplifier is to be mounted vertically be sure that it is in a place where adequate air
Will flow along the length of its heatsink fins for cooling.
NEVER mount the amplifier up side down, this will cause the heat to rise back into the
amplifier causing thermal shutdown or possible permanent damage.
NEVER mount the amplifier in a location that is subject to direct sunlight or exposed to
Moisture.
Be sure to mount the amplifier to a strong, solid surface which will not give way under the
stress of a sudden stop or accident.
Make sure that the mounting screws will not penetrate the gas tank, brake and fuel lines,
wiring or other critical parts of your car when installed.
Class ''D'' Technology
1 Ohm Stable
Spec Audiophile Grade Components
High Efficiency PWM Power Supply
- Multi-stranded power toroid
- Tow toroidal core
- MOSFET transistors
Oversized Capacitor Banks
Discrete Mount Power and
speaker terminals
Variable Low Pass Electronic
Crossover 50Hz - 250Hz
Built in power bridging module
Circuit / Thermal / Overload Protection
Bridge Sync Capable
Remote Level Control
PHD11000
PHD2050/2200/4050/4075

-4-
NEVER operate the amplifier without the proper power and ground wire, 10 gauge minimum.
NEVER operate the amplifier without proper fusing. Fuse holder must be located with in
0.5 meters from the battery. This fuse is to protect the car not the electronics. In case of a
short, the fuse will blow instead of the wire burning up. Using other than the recommended
fuse ratings at the battery and at the amplifier may cause damage to the amplifier and will
Do not run wiring underneath or outside the car since exposure to the elements may cause
the insulation to deteriorate rapidly, resulting in short-circuits and/or intermittent operation.
To help minimize interference, it is best to run the power cables along the opposite side
Whenever wires pass through metal, rubber or plastic grommets must be used to prevent
Whenever possible, use cable ties, mounting clamps and similar wiring aids. (available
from an electrical supply or auto parts store) Adding stress relief loops to wiring is also
It is best to test the system before the amplifier is mounted and interior of car is reassembled.
If the temperature inside your car reaches extreme levels(such as sitting locked up for
several hours in the hot sun or exposed to a very cold winter's day)the amplifier may go
into protection mode and shut off. Leave the unit off until the ambient temperature returns
The amplifier operates with any vehicle using a 12 volt negative ground system. If you are
not sure of the type of electrical system in your vehicle, consult your authorized dealer or
NEVER ground the speaker leads and NEVER allow the speaker leads to come in contact
Remote turn on wire must be switched by the radio does not have a remote turn on or
antenna output, connect to wire that has a positive 12 volts when the key is turned to the
Do not listen to high volumes for extended periods of time or hearing damage may occur.
CONTINUOUS EXPOSURE TO SOUND PRESSURE LEVELS OVER 100dB MAY
CAUSE PERMANENT HEARING LOSS. HIGH POWERED AUTOSOUND SYSTEM
SENSE AND PRACTICE SAFE SOUND.
MAY PRODUCE SOUND PRESSURE LEVELS WELL OVER 130dB. USE COMMON
void your warranty.
all cables should be run beneath carpets and inside trim pieces.
from the audio cables
the metal from wearing through the installation and causing a short.
advisable to prevent straining or breakage.
to normal.
qualified mechanic.
With each other. Speaker wire should be 18 gauge or larger.
accessory. If the amplifier does not turn off the battery will die.

-5-
INSTALLATION
1. After reading precaution, decide where you are going to install the unit. Also, see Fig.1.
2. Once the location has been determined, place the amplifier into position. Using a felt tip
pen or pencil mark the four holes to be drilled for mounting. NEVER use the amplifier as
a template for drilling. It is very easy to damage the amplifier surface in this manner.
3. Remove amplifier. Drill four 3.5 m/m holes into mounting surface. If you want to mount
4. If possible, test the system to ensure it is operating correctly before final mounting of
5.
INSTALLATION DIAGRAM
MOUNTING:
Mount the amplifier using the supplied 4 self tapping screws.
the amplifier to MDF or wood panel, drill four 3.0m/m diameter holes into mounting surface.
the amplifier.
FIG.1
SELF TAP SCREWS

-6-
POWER CONNECTIONS
CONNECTIONS
INPUT CONNECTIONS
It is important to have good quality power and ground connections. Remember, to complete
an electrical circuit, the ground connection is just as important as the positive power
connection. Before any power connections are made, disconnect the ground cable at the
When the power supply lead, memory backup lead or ground lead are extended use a 5mm
(AWG5) or larger automotive grade cable which will withstand friction and heat to safe
GND = Connect the proper gauge ground wire to the amplifier "GND" terminal. Locate the
position on the chassis of the car to which the amplifier is to be grounded. The surface must
be free from any paint or dirt. This can be accomplished with a small grinding bit, sand
paper or wire wheel. NOTE: Do not ground the amplifier to the "frame of the car. The frame
on most cars and trucks is not grounded to the chassis(body). Use Solder or a clamp ring to
connect the ground wire. Pre-drill the prepped chassis to bolt the ground ring terminal with
nut, bolt and lock washers. Insulate metal and connector with paint or silicon to prevent
rust and oxidation. Silicon also works great to prevent nuts and bolts from working loose in
a harsh environment of an automobile. Upon completion of the ground connection, grab
wire or connector and confirm that it is a solid connection. To prevent engine noise, it is
REM = Connect the remote wire (power antenna output) from the head unit to the remote
turn-on wire of the amplifier. If the head unit is not equipped with a remote/antenna output,
locate a wire that is controlled by the accessory position of the key. It is important to have
the amplifier turn off with the radio or key. If the amplifier remains on, the result will most
12V = Connect the proper gauge power wire to the amplifier "B+" terminal. Run wire to
wards the fuse holder that is no greater then 0.5 meters from the battery. Remember, the
fuse is to protect the safety of the car in the case of a short. Connect fuse holder to battery,
This amplifier will accept low level inputs only. Low level is the same as line level. The low
level signal is carried through RCA cables. It is preferred to use low level inputs to the amplifier
if the head unit is equipped with the low level outputs. If not, you can use a "high to low
Connect the low level/line level RCA cables from the head unit, or signal processor, to the
converter" available through your local car audio shop.
line level input on the amplifier. See Fig.2 system wiring diagrams.
battery.
grade against fires occurring as a result of short-circuiting.
recommended to ground the head unit and other audio electronics in the same location.
likely be a dead battery.
but do not install fuse at this time.

-7-
2CHANNEL SYSTEM WIRING DIAGRAM (PHD2050, PHD2200)
AUTO - ANTENNA LEAD
CH1 CH2
CAR STEREO HEAD UNIT
L
R
MIN MAX
LEVEL SUBSONIC L.P.F
250Hz20Hz
BASS
BOOST
H.P.F
L
R
1.2kHz80Hz50Hz 12dB0dB 50Hz FULL
CROSSOVER
LINE
INPUT
LINE
OUTPUT
B+B+GNDGND REMREM
FIG.2
L
R
MIN MAX
LEVEL SUBSONIC L.P.F
250Hz20Hz
BASS
BOOST
H.P.F
L
R
1.2kHz80Hz50Hz 12dB0dB 50Hz FULL
CROSSOVER
LINE
INPUT
LINE
OUTPUT

ON
6dB 6dB
12dB 12dB
00
CH4
CH3
OFF ONOFF
CH4
CH3
CROSSOVERCROSSOVER
LINE
INPUT
CH2
CH1
LINE
OUTPUT
CH3/4CH1/2
MIN MAX
LEVEL
MIN MAX
LEVELL.P.FH.P.F
50Hz80Hz 250Hz1.2kHz
TREBLE
BOOST
TREBLE
BOOST
4CHANNEL SYSTEM WIRING DIAGRAM (PHD4050)
ON
6dB 6dB
12dB 12dB
00
CH4
CH3
OFF ONOFF
CH4
CH3
CROSSOVERCROSSOVER
LINE
INPUT
CH2
CH1
LINE
OUTPUT
CH3/4CH1/2
MIN MAX
LEVEL
MIN MAX
LEVELL.P.FH.P.F
50Hz80Hz 250Hz1.2kHz
TREBLE
BOOST
TREBLE
BOOST
AUTO - ANTENNA LEAD
CAR STEREO HEAD UNIT
B+B+GNDGND REMREM
CH3 CH4CH2CH1
-8-

BASS
BOOST
BASS
BOOST
MAX
LEVEL L.P.F
250Hz
H.P.F
1.2kHz
80Hz
50Hz
FULL
CROSSOVER
H.P.F
12dB
0dB 1.2kHz
80Hz 250Hz50Hz
L.P.F
FULL
12dB
0dB MIN MAX
LEVEL
CROSSOVER
4CH2CH
MIN
CH1
CH2
CH3
CH4
INPUT MODE
LINE
INPUT
LINE
INPUT
CH3/4CH1/2
-9-
4CHANNEL SYSTEM WIRING DIAGRAM (PHD4075)
CH3 CH4CH2CH1
AUTO - ANTENNA LEAD
CAR STEREO HEAD UNIT
B+B+GNDGND REMREM
FIG.2

1CHANNEL SYSTEM WIRING DIAGRAM (PHD11000)
SUBSONIC
FILTER
L
RMASTER
/ SLAVE
REMOTE
MASTER SLAVE
BASS
BOOST
L
R
IN
OUT
PHASEL.P.F
050Hz0dB15Hz 180250Hz12dB50HzMIN MAX
LEVEL
LINE
OUTPUT
LINE
INPUT
AUTO - ANTENNA LEAD
CH1CH2
CAR STEREO HEAD UNIT
B+B+GNDGND REMREM
SUBSONIC
FILTER
L
RMASTER
/ SLAVE
REMOTE
MASTER SLAVE
BASS
BOOST
L
R
IN
OUT
PHASEL.P.F
050Hz0dB15Hz 180250Hz12dB50HzMIN MAX
LEVEL
LINE
OUTPUT
LINE
INPUT
-10-

ON
PROTECT
GND REM B+ L R
BRIDGED
POWER SPEAKER OUTPUT
FUSE
ON
PROTECT
GND REM B+ L R
BRIDGED
POWER SPEAKER OUTPUT
FUSE
ON
PROTECT
GND REM B+ L R
BRIDGED
POWER SPEAKER OUTPUT
FUSE
-11-
FIG.3
This amplifier can operate in one, two or three channel mode. The minimum impedance for
single channel (bridged/mono) operation is 4 or 8 ohms. Tri channel power is referred to
stereo and mono at the same time. Minimum impedance remains the same for three channel
(front /subwoofer) systems as long as proper passive crossovers are used. Connect right
and left speaker wire to corresponding speaker output terminals of the amplifier. Be sure to
have the positive wire from the speaker connected to the positive speaker terminal of the
amplifier and the negative wire from the speaker must connect with the negative speaker
terminal of the amplifier. Reversing any of these connections will result in the speaker cones
moving out of phase which causes bass cancellation. See Fig.3 Speaker Output Connections.
SPEAKER CONNECTIONS
2 CHANNEL SPEAKER WIRING DIAGRAM (PHD 2050, PHD 2200)
1 SPEAKER BRIDGED
2 SPEAKER STEREO
3 SPEAKER TRI MODE
4 - 8 Ohm
1CH
2 - 4 Ohm
1 CH 2 CH
WOOFER 2CH+1CH
4 - 8 Ohm
2 CH
3 CH
1 CH
4 - 8 Ohm

ON
PROTECT
GND REM B+
POWER FUSE BRIDGED
CH1 CH2
SPEAKER OUTPUT
CH3 CH4
BRIDGED
ON
PROTECT
GND REM B+
POWER FUSE BRIDGED
CH1 CH2
SPEAKER OUTPUT
CH3 CH4
BRIDGED
ON
PROTECT
GND REM B+
POWER FUSE BRIDGED
CH1 CH2
SPEAKER OUTPUT
CH3 CH4
BRIDGED
4 CHANNEL SPEAKER WIRING DIAGRAM (PHD 4050)
SPEAKER CONNECTIONS
2 SPEAKER BRIDGED
2 SPEAKER + 1 SUBWOOFER
4 SPEAKER STEREO
6 SPEAKER HEX MODE
ON
PROTECT
GND REM B+
POWER FUSE BRIDGED
CH1 CH2
SPEAKER OUTPUT
CH3 CH4
BRIDGED
4-8 Ohms
1 CH 2 CH
SUB WOOFER
1CH 2 CH
2-4 Ohms
3 CH
4-8 Ohms
1CH 2 CH
2-4 Ohms
3CH 4 CH
FIG.3
4-8 Ohms
5 CH
4-8 Ohms
6 CH
4-8 Ohms
4 CH
3 CH
2 CH1CH
4-8 Ohms
-12-

2 SPEAKER BRIDGED
SUB WOOFER
3 CH
4-8 Ohms
2 CH1CH
2 SPEAKER + 1 SUBWOOFER
2-4 Ohms
4 SPEAKER STEREO
6 SPEAKER HEX MODE
4 CHANNEL SPEAKER WIRING DIAGRAM (PHD 4075)
SPEAKER CONNECTIONS
4-8 Ohms
1 CH 2 CH
FIG.3
2-4 Ohms
4 CH
3 CH
2 CH
1CH
4-8 Ohms
5 CH
4-8 Ohms
6 CH
4-8 Ohms
4 CH
3 CH
2 CH1CH
CH3 CH4
BRIDGED
ON
PROTECT
CH1 CH2
BRIDGED
GND REM B+
POWER SPEAKER OUTPUT
FUSE
CH3 CH4
BRIDGED
ON
PROTECT
CH1 CH2
BRIDGED
GND REM B+
POWER SPEAKER OUTPUT
FUSE
CH3 CH4
BRIDGED
ON
PROTECT
CH1 CH2
BRIDGED
GND REM B+
POWER SPEAKER OUTPUT
FUSE
-13-

FUSE
SPEAKER OUTPUT
REM
POWER
GNDB+
FUSE
SPEAKER OUTPUT
REM
POWER
GNDB+
SPEAKER CONNECTIONS
The Class "D" amplifier is a SINGLE CHANNEL dedicated subwoofer amplifier. Unlike
other amplifiers, the Class "D" operates as a single channel and cannot be bridged.
Don't be fooled by the outputs. Two outputs are used strictly for convenience and are
paralleled internally on the amplifier. This means that if both outputs are used with one
driver each, the amplifier sees the same load as if the same drivers are connected to
Only one output terminal. See diagram below.
4OHM
SUBWOOFER
4OHM
SUBWOOFER
4OHM
SUBWOOFER
In both diagrams, the amplifier sees a 2 ohm load.
1 CHANNEL SPEAKER WIRING DIAGRAM (PHD 11000)
-14-
FIG.3

FUSE
SPEAKER OUTPUT
REM
POWER
GNDB+
FUSE
SPEAKER OUTPUT
REM
POWER
GNDB+
MONO BRIDGED
Master
Amplifier
Slave
Amplifier
Using a lead wire of 8 gauge or
bigger connect from the master
Amp's negative(-) speaker
terminal to the slave Amp's
negative(-) speaker terminal.
WIRING SUBWOOFERS (DUAL AMPS)
When using dual amplifiers to power one subwoofer, the Positive terminal of the Subwoofers voice
coil is connected the positive terminal of the MASTER Amplifier and the Negative terminal of the
Subwoofers voice coil is connected to Positive terminal on the SLAVE Amplifier. This procedure will
allow the total power of both amplifiers to be added together and act like a single powerful
amplifier. Please check that your subwoofer power handling capabilities are not exceeded when
hooking two amplifiers to it.
CAUTION
Always check your speaker load with a multi-meter before hooking up to the amplifier. These
digital amplifiers are only 1 ohm stable. Any Impedance (load) smaller than 1 ohm will damage
the amplifier. Such Damage is not covered under warranty either, so pay strict attention to what
connections are made to the amplifier.
SPEAKER CONNECTIONS
SUBSONIC
FILTER
L
RMASTER
/ SLAVE
REMOTE
MASTER SLAVE
BASS
BOOST
L
R
IN
OUT
PHASEL.P.F
050Hz0dB15Hz 180250Hz12dB50HzMIN MAX
LEVEL
LINE
OUTPUT
LINE
INPUT
SUBSONIC
FILTER
L
RMASTER
/ SLAVE
REMOTE
MASTER SLAVE
BASS
BOOST
L
R
IN
OUT
PHASEL.P.F
050Hz0dB15Hz 180250Hz12dB50HzMIN MAX
LEVEL
LINE
OUTPUT
LINE
INPUT
Master
Amplifier
Slave
Amplifier
MASTER SLAVE
MASTER SLAVE
Front View
Rear View
-15-

L
R
MIN MAX
LEVEL SUBSONIC L.P.F
250Hz20Hz
BASS
BOOST
H.P.F
L
R
1.2kHz80Hz50Hz 12dB0dB 50Hz FULL
CROSSOVER
LINE
INPUT
LINE
OUTPUT
ADJUSTMENTS
1.Set to the "H.P.F" position when the amplifier is used to drive a tweeter/midrange system.
The frequencies below the crossover point will be attenuated at 12dB/octave. Permits
adjustment of the crossover frequency ,by rotating the knob to select any frequency
2.Set to the "L.P.F" position when the amplifier is used to drive a subwoofer. The frequencies
above the crossover point will be attenuated at 12dB /octave. Permits adjustment of the
crossover frequency, by rotating the knob to select any frequency between 50Hz to 250Hz
3.Set to the "OFF" position when the amplifier will be used for driving full-range speakers.
The full frequency band width (20Hz - 20kHz) will be output to the speakers without high
4.Level adjustment-The sensitivity adjustment is to allow the amplifier to work with many
different brands of head units. It allows input signal to vary between 200 millivolts to 6
volt from the head unit or other signal processor. Start by setting the sensitivity adjustment
to the "MIN" (6 volts).Using a cassette or compact disc that you are familiar with ,turn on
head unit to the 3/4 volume setting. Slowly turn up sensitivity adjustment towards the
"MAX" (200 millivolts) using a flat head screw driver. Stop turning on the onset of distortion
and turn back just a slight. The 3/4 volume setting is now the "maximum" volume for the
head unit. The goal is to keep the level control to the lowest setting yet still have enough
signal to drive the amplifier. This is done to prevent over driving the amplifier and to keep
system noise to a minimum. It is important not over drive speakers (at point of distortion)
this will cause permanent damage to the speakers. Also, if the amplifier itself is over driven,
5.The "BASS" function can be selected to increase low frequency response output, or
decrease frequency response output. The "BASS" function will be working at only "OFF"
between 80Hz to 1.2kHz as the crossover point.
as the crossover point.
or low frequency attenuation.
it could be damaged.
or "L.P.F" position.
The BASS is adjustable from 0 ~ 12dB boost at 50Hz.
FRONT PANEL
PHD2050, PHD2200
-16-

SUBSONIC
FILTER
L
RMASTER
/ SLAVE
REMOTE
MASTER SLAVE
BASS
BOOST
L
R
IN
OUT
PHASEL.P.F
050Hz0dB15Hz 180250Hz12dB50HzMIN MAX
LEVEL
LINE
OUTPUT
LINE
INPUT
BASS
BOOST
BASS
BOOST
MAX
LEVEL L.P.F
250Hz
H.P.F
1.2kHz
80Hz
50Hz
FULL
CROSSOVER
H.P.F
12dB
0dB 1.2kHz
80Hz 250Hz50Hz
L.P.F
FULL
12dB
0dB MIN MAX
LEVEL
CROSSOVER
4CH2CH
MIN
CH1
CH2
CH3
CH4
INPUT MODE
LINE
INPUT
LINE
INPUT
CH3/4CH1/2
PHD11000
PHD4075
ON
6dB 6dB
12dB 12dB
00
CH4
CH3
OFF ONOFF
CH4
CH3
CROSSOVERCROSSOVER
LINE
INPUT
CH2
CH1
LINE
OUTPUT
CH3/4CH1/2
MIN MAX
LEVEL
MIN MAX
LEVELL.P.FH.P.F
50Hz80Hz 250Hz1.2kHz
TREBLE
BOOST
TREBLE
BOOST
FRONT PANEL
PHD4050
-17-

-18-
This section provides you with a catalog of amplifier symptoms and their probable causes
and solutions. Before you consult this listing, make sure the vehicle's electrical system is
working properly by verifying that other electrical items (e. g. headlights, windows, etc.)
Still function correctly.
TROUBLE SHOOTING GUIDE.
No Audio Low or N.C Remote
Turn-on connections
Blown Fuse
Power wires not connected
Blown or non speakers
connected
Check remote turn-on voltage at
amp and head unit
Replace with new fast-blow fuse
Check butt splices or solder joints
Check ground and battery
connections
Use VOM or DVM to measure speaker
coil
impedance; check speaker wiring
connections
SOLUTIONPROBABLE CAUSE
SYMPTOM
See adjustment procedure and check
each step;
Inspect each speaker for damage
and repair or replace suspected
component
Refer to head unit owner's manual
Input Sensitivity not set
properly
or damaged speaker cones
Low turn-on voltage
Distorted Audio
Audio Level Low Mute circuit on head
unit is on.
Check electrical system for low
voltage;
Check ground connection
Audio Lacks Speakers wired with wrong
polarity, causing
cancellation of bass
frequencies
Check polarity of wires from
amplifiers to each speaker as defined
by the system design
Check battery voltage at amplifier
during operation
External Fuse
Blowing
Incorrect wiring or short
circuit
Refer to electrical installation and
check each installation step
Whining noise
on audio with
engine running
Amplifier is picking
up alternator noise
Install an in-line noise filter on the
head unit's power wire; Check
alternator routing diodes or voltage
regulator for proper operation. Check
all grounds , battery voltage, and
RCA cables
Ticking noise on
audio with
engine
running
Amplifier is picking up
radiated spark noise
Check RCA audio cable; Install an
in-line noise filter on the head unit's
power wire. Check spark plug wires.

Audiophile Sound Systems