Power bass XL-2305MX User manual

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ATTENTION !!I
READ BEFORE INSTALLING
IMPORTANT : This amplifier is designed tor operation in vehicles with 12-volt Negative ground electrical svstems univ.
Tech Support
8:30am-5:30pm Pacific Time
[phone]
www.powerbassusa.com
REMOTE TURN ON
IONX6SSl:lry
On/Off Switch
Thank you for your purchase of ourPowerBass
XLAmplifier. The small size of these amplifiers
makethem a perfect solution for UTV's, golf carts,
motorcycles and other Power Sportvehicles.
In order to ensure properoperation it is highly
recommended to wire both theGround (GND) and
Positive (BATT+) cablesfrom youramplifier to the
battery directly.
Due to the extensive use of aluminum frames and
insulators on these type of vehicles, it may be
difficult or impossible to get the amplifier to
operate properly by using a chassis ground.
A POOR GROUND CAN RESULT IN ONE OR
MORE OF THE FOUOWING PROBLEMS :
• Cause the amplifier to cut out intermittenUy
• Cause the power cables to overheat and possibly
melt the terminals on the amplifier
• Create engine noise
• Damage the radio
Xla...ln201•

ower
X
XL-2305MX
XL-4255MX
XL POWERSPORT FULL RANGE MX AMPLIFIER
Owners Manual
Please read through this manual to familiarize yourselfwith your new amplifier. Should your PowerBass
Xtreme mobileamplifiereverrequire service, you will need to have the original dated receipt. ·

ower~
X
AMPLIFIERS
Thank you and Congratulations
Thank you for your decision to purchase a PowerBass USA Xtreme mobile amplifier! Our new mini amplifiers
are the result of extensive engineering, testing, and bullet proof construction. Their versatility enables compat-
ibility with optional signal and audio processors. These high quality MOSFET amplifiers may be configured to
allow maximum flexibility in designing different types of speaker systems.
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FULL RANGE CLASS D MINI AMPLIFIERS
The PowerBass XL Series are high quality MOSFET amplifiers that are capable of running a system full range,
or they may be selected only to power subwoofers. It is important that you closely follow the wiring instructions
contained in this Owners Manual so that you get the most from your PowerBass Xtreme mobile amplifier.
tJ. Caution tJ.
High powered audio systems in a vehicle are capable of generating higher than " Live Concert " levels of sound pressure. Continued exposure
to excessively high volume sound levels cou ld cause hearing loss or damage . Also , operation of a motor vehicle while listening to audio
equipment at high volume levels may impair your ability to hear external sounds such as horns , warning si gnals , or emergency vehicles-thus
creating a potential traffic hazard . In the interest of safety, PowerBass USA high ly recommends listening at lower volume levels when dr i ving.
3

TECHNICAL FEATURES
• IPX 67 Water Resistant Sealed Design
• Aluminum Diecast End Caps with Integrated Input/Output Connections
• FRO (Full Range Class- □) Multi-Channel Technology
• International Rectifier Chip Set
• Conformal Coated PC Board to Resist Moisture, Dust and Extreme Heat
• AUX Input Accepts MP3, iPod® or Portable Source Device
• Wrap-around Aluminum Heatsink Shell
• Ultra Low Current Draw
• High Damping Control Circuit
• High Efficiency SMD Circuit Technology
• 4-Layer Copper Plated PCB
• Digital Sound Optimization Circuitry
• Quiet Switching
• Bass EQ Circuitry Centered at 45Hz (+/- 18dB )
• High Current Voltage Ripple Rejection Circuitry
• Virtual Silence Turn On/Off Mute Circuit
• Advanced Protection Circuitry
• Low Level RCA and High Level Speaker Inputs
• Wired Remote Level Control (XL-2305M)
• AUX Output (3.5mm)
•;Pod® is a registered trademark of Apple
FRO-FULL RANGE CLASS D TECHNOLOGY
This amplifier represents the very latest in Class D technology. The XL Series uses the new IR ® (International
Rectifier) platform which has been under development for the past several years. IR®, a leader in PWM circuit
design, has worked in conjunction with PowerBass engineers to produce more stable power output, minimal
RF interference and improved sound quality.
The benefits of this cooperative effort are many and include improved temperature, frequency , voltage regulation
and drive capability to name a few.
The PC board features a conformal coating that resists moisture, dust and extreme heat. Combine that plus
their small size and these amplifiers are perfect for many Powersport applications including UTV, golf cart and
motorcycle and Watersport vessels.
The result to the user is a all around improved product that will provide years of listening enjoyment.
InternationaI
I"R Rectifier
THE POWER MANAGEMENT LEADER
IR ® Is a registered trademark of International Rectifier Corporation.

INSTALLATION EXPERIENCE
Installation of PowerBass mobi le amplifiers requires detailed knowledge of electronics wiring and proper
speaker impedance . We strong ly recommend installation by an authorized PowerBass dealer. This Owners
Manual only provides general installation and operation instructions. If you have any reservations about
your installation skills, please contact your local PowerBass dealer for assistance.
IMPORTANT : This amplifier is designed for operation in veh i cles with 12-volt Negative ground
electrical systems only.
PREPARING FOR INSTALLATION
NOTE : The tools listed below may be required for basic i nstallation
• An electric drill with bits
• Philips head and standard screwdrivers
• Wire strippers
• Crimping tool
• VOM (electronic volt ohm meter)
• Heat shrink tubing and heat gun
• Soldering iron
• Electronic (Rosen not Acid Core) Solder
INSTALLATION PRECAUTIONS
NOTE: Proceed only if you are a qualified installer, otherwise; see your Authorized PowerBass
Dealer to professionally install this amplifier. Always wear protective eyewear when using
tools.
• Turn off all stereo and other electrical devices before you begin.
• Disconnect the negative (-) lead from your vehicles battery.
• Locate all fuel lines, brake lines, oil lines, and electrical cables when planning the install.
• Make sure there is at least 2-inches (5 cm) around the air vents on the amplifier.
• When connecting ground points, make sure all paint is carefully scrapped away from the auto body
and contact is made with bare metal.
• Use a utility knife to trim away fabric from hole locations before drilling or cutting.
• When running power cables through sheet metal, be sure to use grommets to properly insulate the
metal edges from the wire insulation.
• If possible, use tubing through grommets.
WARNING : Check your vehicle's owner's manual before disconnecting the battery. Disconnecting
the battery on some vehicles may require an anti-theft code when reconnecting the battery and
require the on-board computer to be reset at the dealership. Check with your local dealer if you
are uncertain.
5

MOUNTING THE AMPLIFIER
f
Fig.1 Mounting Amplifier
To keep your PowerBass Xtreme amplifier running at top performance, choosing the proper location is of
utmost importance. Both Thermal and Overload protection are built in.
In the event of overheating, the amplifier will turn off and only restart when cooled. For this reason the
amplifier should be mounted in a location which will allow air to circulate freely. The compact size of the
PowerBass XL Series amplifier allows greater flexibility in mounting.

MOUNTING LOCATION
The XL Series amplifiers are IPX67 rated and feature a conformal coating app l ied to the PC board . This coating
makes them resistant to water, dust, and quick submersion. Care should still be taken to protect the amplifier
from water and find a mounting location that is not likely to get wet. Take care not to mount in a vehicle/vessel
where it can cause interference with the factory installed electronic devices.
The unique wrap around outer shell ( heatsink) allows the XL Series amplifiers to be mounted in spaces with
minimal air flow. It is important that whatever location is selected the amplifier must be mounted securely in a
manner keeps the unit intact even during rough jolts that can occur to the vehi c le / ve s sel.
You may use the amplifier as a template and mark the four screw locations with a felt tip pen . Set the amplifier
aside before drilling . Use caution to make sure there are no objects behind the installation surface that may
become damaged during drilling .
If mounting under a seat, make sure there is at least 1-inch (2 .5 cm ) of space above the amplifier 's heatsink
to permit proper cooling .
The best places to mount your amplifier are: The floor of the trunk , under a seat, on the back of the rear seat or
a storage compartment will air can circulate . For alternate installation locations , please consult your authorized
PowerBass Dealer .
NOTE: Do not use a drill wi th driver bit to mount the a mpl i fier. Excessive force c ould cause
the mounting feet to crack.
* -tt WARNING -
• Do not install in a place where it could injure the driver or passengers if the vehicle
stops suddenly.
• Try to avoid mounting the amplifier on a subwoofer enclosure , as extended exposure ·
to vibration may cause malfunction of the amplifier.
• Don't mount the amplifier so that the wire connections are unprotected or are sub -
ject to pinching or damage from nearby objects .
• The DC power wire must be fused at the battery positive (+) terminal connection.
Before making or breaking power connections at the amplifier power terminals ,
disconnect the DC power wire at the battery end.
• The battery of the car audio system must be disconnected until the entire wiring and
installation is completed.
7

XL-23O5MX CONTROL PANEL LAYOUT
5
4 6
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INPUT
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XL-Jii!305MX
0 2 Channel • full Range Digital 0
OUTPUT POWER
7 8
F ig .2 2-Channel Pane l Layout
NOTE : Panel Layout and Controls may differ by model .
1. Low Level Inputs/Outputs (from left to right)
A. LOW LEVEL RCA Inputs
@
Low Level RCA input that connects to source units with RCA line level outputs. A source unit with a minimum input of 250mV is
required for proper operation. However , this input can accept levels up to 1 OVrms.
B. AUXlnputJack
This 1/8-inch (3.5mm) mini jack can be used to accept an MP3, iPOD or smartphone as the source unit from that devices head-
phone (3.5mm) output.
C. AUX Output Jack
This 1/8-inch (3.5mm) mini jack can be used to connect to multiple MX Series Amplifiers.
D. REMOTE LEVEL INPUT Connector
This is the connector port for the Remote Level Controller. Now the amplifiers secondary gain circuit can be adjusted from the
drivers seat. Please note this is active in all settings HP , LP, FULL.

2. POWER/STATUS Indicator
This clear LED lights Blue when the power is on--0r turns Red constantly when the built - in protection circu i try is activated . Red i ndicates a
problem with the system in relation to the amplifier (See Troubleshooting Tips) .
3. GAIN Control
This control is used to match the input sensitivity of the amplifier to the particular source unit that you are us i ng up to 250mV to 10 volts.
4. X-OVER Switch for LPF/FULUHPF
Activates the built-in electronic crossover network . Works in conjunction with the LPF and HPF adjustable control. When set to FULL t he
amplifier runs Full Range and the electronic crossover circuitry is bypassed.
5. HPF/LPF
This control is continuously adjustable from 40Hz to 400Hz at 12dB per octave when the X-OVER sw i tch is set to LPF (Low Pass Filter ) or
HPF (High Pass Filter).
6. BASS EQ Control
This equalization circuit is used to enhance the low frequency response of the vehicle 's interior . With up to 1 BdB of boost centered at 45Hz ,
the BASS EQ can be adjusted to meet your own personal taste. This is only operational with LPF mode on.
7. SPEAKER OUTPUT
Be sure to observe the correct speaker polarity and follow the speaker wir i ng diagrams found elsewhere in this owners manual.
Grey Wire = Right +
Grey/Black Wire = Right -
White Wire = Left +
White/Black = Left -
8. POWER AND GROUND INPUT Wires (from left to right)
A. Red Wire BATT+ (Power Input Connection)
B. Blue Wire REM (Remote Turn-On Connection)
C. Black Wire GND (Ground Input Connection)
A. BATT+ (Power Input Connection)
This wire is the main power input for the amplifier and mus t be connected directly to the positive (+ ) termina l of the ca r battery .
B. REM (Remote Input Connection)
This wire must be connected to a switched + 12V source. Typically, remote turn-on leads are provided at the sou r ce unit t hat will
turn on and off the amplifier in correspondence with the source . If th is lead is not at the source unit , then as witched + 12V supply
must be used , like the ACC, + 12V.
C. GND (Ground Input Connection)
A good quality ground is required for your PowerBass Xtreme amplifier to operate at peak performance. A short length of cable the
same gauge as your power cable should be used to attach t he ground directly to the chassis of the vehic l e. Make sure that all of
the pain t is sanded or scraped away to ensure a quality ground connection. NOTE: If installing in a boat , UTV or motorcycle
make sure your ground wire is connected to the negative ( - ) terminal of the battery.
FUSE-IMPORTANT
Due to the limited space on the XL amp l ifier chassis they do NOT come with internal fusing! Instead we have inc l uded an in - line fuse holder
that can be connected directly to the BATT+ input on the amplifier . Please note the proper ampere fuse fo r each model are listed below . Never
replace a fuse with a higher rating then what is listed.
XL-2305MX 60A
XL-4255MX BOA
9

XL-4255MX CONTROL PANEL LAYOUT
11 12
F ig.3 4-Chan nelP ane lL ayo ut
NOTE : Panel Layout and Controls may differ by model .
1. POWER/STATUS Indicator
This clear LED lights Blue when the power is o~r turns Red constantly when the built-in protection circuitry is activated. Red indicates a problem with the
system in relation to the amplifier (See Troubleshooting Tips).
2. LOW LEVEL INPUTS/OUTPUTS (from left to right)
A. FRONT low level RCA Inputs
Low Level RCA input that connects to source units with RCA line level outputs. A source unit with a minimum input of 250mV is required for proper
operation. However, this input can accept levels up to 1 OVrms.
B. AUXlnputJack
This 1/8-inch (3.5mm) mini jack can be used to accept an MP3, iPOD or smartphone as the source unit from that devices headphone (3.5mm)
output. When using AUX input, the amplifier must be in 2CH mode.
3. FRONT HPF
This control is continuously adjustable from 40Hz to 400Hz at 12dB per octave).
4. FRONT GAIN Control
This control is used to match the input sensitivity of the amplifier to the particular source unit that you are using up to 250mV to 10 volts.

5. LOW LEVEL INPUTS/OUTPUTS (from left to right)
A. AUX Output Jack
This 1 /8-inch (3.5mm) mini jack can be used to connect to multiple MX Series Amplifiers.
B. REAR Low Level RCA Inputs
Low Level RCA input that connects to source units with RCA line level outputs. A source unit with a minimum input of 250mV is required for proper
operation. However, this input can accept level s up to 1 OVrms.
6. REAR BASS EQ Control
This equalization circuit is used to enhance the low frequency response of the vehicle's interior. With up to 1 BdB of boost centered at 45Hz, the BASS EQ can
be adjusted to meet your own personal taste.
7. REAR HPF/LPF
This control is continuously adjustable from 40Hz to 400Hz at 12dB per octave when the X-OVER switch is set to LPF (Low Pass Filter) or HPF (High Pass Filter).
8. REAR X-OVER Switch for LPF/FULUHPF
Activates the built-in electronic crossover network. Works in conjunction with the LPF and HPF adjustable control. When set to FULL the amplifier runs Full
Range and the electronic crossover circuitry is bypassed.
9. MOOE Switch
Matches the input from the Source Unit to that of the amplifier, either 2 or 4 Channel. This eliminates the use of 'Y" adapters and provides a cleaner input signal.
When the 2-Channel mode is selected, both front and rear outputs will operate with only one pair of low level RCA inputs. In 2CH mode, use front inputs only.
10 . REAR GAIN Control
This control is used to match the input sensitivity of the amplifier to the particular source unit that you are using up to 250mV to 10 volts.
11 . REAR SPEAKER OUTPUT / FRONT SPEAKER OUTPUT
Be sure to observe the correct speaker polarity and follow the speaker wiring diagrams found elsewhere in this owners manual.
Green Wire=Left Rear+
Grey/Black Wire=Left Rear-
Purple Wire = Right Rear +
Purple/Black Wire = Right Rear -
White Wire = Left Front +
White/Black = Left Front -
Grey wire = Right Front +
Grey/Black = Right Front -
12 . POWER AND GROUND INPUT Wires (from left to right)
A. Red Wire BATT+ (Power Input Connection)
B. Blue Wire REM (Remote Turn -On Connection)
C. Black Wire GND (G round Input Connection)
A. BATT+ (Power Input Connection)
This wire is the main power input for the amplifier and must be connected directly to the positive (+) terminal of the car battery.
B. REM (Remote Input Connection)
This wire must be connected to a switched+ 12V source. Typically, remote turn-on leads are provided at the source unit that will turn on and off the
amplifier in correspondence with the source. If this lead is not at the source unit, then a switched + 12V supply must be used , like the ACC, + 12V.
C. GND (Ground Input Connection)
A good quality ground is required for your PowerBass Xtreme amplifier to operate at peak performance. A short length of cable the same gauge as
your power cable should be used to attach the ground directly to the chassis of the vehicle. Make sure that all of the paint is sanded or scraped
away to ensure a quality ground connection. NOTE :If installing in a boat, UTV or motorcycle make sure your ground wire is connected
to the negative (- ) terminal of the battery .
FUSE-IMPORTANT
Due to the limited space on the XL amplifier chassis they do NOT come with internal fusing! Instead we have i ncluded an in-line fuse holder that can be con-
nected directly to the BATT+ input on the amplifier. Please note the proper ampere fuse for each model are listed below. Never replace a fuse with a higher
rating then what is listed. (XL - 23O5MX uses 60A, XL - 4255MX uses BOA)
11

POWER WIRING AND SIGNAL CONNECTIONS
*** WARNING ***
Disconnect the negative {-) battery terminal before you start any wiring work! The
battery of your car audio system must be disconnected until the entire wiring
installation is completed.
• Use rubber grommets when running cables through any metal or sharp plastic, to prevent accidental
shorting or shearing. Make sure the cables do not interfere with normal operation of the vehicle.
• The audio signal cables (RCA interconnects) should be kept far away from any potential sources of
electrical interference such as electronic veh i cle management systems (re lays , engine computers etc.),
wiring harnesses, fuel pumps etc.
FUSE HOLDER
Within 18"
of Battery
ell
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+
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ill
,, :§
m
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Remote Turn ON
To Switc hed Power
Fig .5 Power Input Connection
To UTV, Motorcycle or Boat
= Battery (- ) Terminal or
Chassis Ground on Car and Trucks
These amplifiers are designed to work within a 10 to 16 volt DC range. Before any wires are connected, the
vehicles electrical system should be checked for correct voltage supply with the help of a voltmeter.
First, check the voltage at the battery with the ignition in the OFF position. The voltmeter should read no less
than 12V. If your vehicles el ectrical system is not up to these specifications, we recommend having it checked
by an auto electrician before any further installation. Once the vehicle is checked, make certain the correct
cable gauge is used. The XL amplifier is capable of accepting up to 8 gauge power and ground cable. We
recommend using as large a gauge cable as possible, use the Power Cable Selection Chart to calculate the
correct power wire size for your application.

POWER WIRING
BATT+ (Power) - Red Wire
This amplifier should be wired direct ly to the vehicle battery using the appropriate size cable. Start at the
vehicle battery and run t he power cable through to the amplifier. Avoid running the power cable over engine
components and near heater cores. The use of an inline fuse or circuit breaker is a must ; this will
prevent the risk of a potential fire caused by a short in your power cable. Connect the fuse ho l der or circuit
breaker as close to the battery positive (+) terminal as possible (within 18" from the battery). You may now
connect the cable to the battery, but remember to leave the fuse out or circuit breaker "off" until all other cable
connections are made.
GND (Ground) - Black Wire
When grounding your amplifier, locate a metal area close to the amplifier that is good source of ground
(preferable the floor pan). Use a short length of cable the same gauge as your power cable. Once again,
investigate the area you wish to use for electrical wires, vacuum lines, and brake or fuel lines. Use either a
wire brush or sandpaper to eliminate unwanted paint for better contact of the ground. NOTE: If installing in
a boat, UTV or motorcycle make sure your ground wire is connected to the negative (- ) terminal
of the battery. See Fig .7
Bolt Ring Connecto r
Fig.6 Proper Chassis Ground
Connection For Cars And Trucks
Note: Remove any paint
below ring connector
Star Washer
Secure the ground cable to the body using a bolt, star washer and nut. Spread silicon over the screw and
bare metal to prevent rust and possible water leaks.
For Power Sport applications such as UTVs, motorcycles and boats it is highly recommended to wire both
the Ground (GND) and Positive (BATT+) cables from the amplifier directly to the battery. NOTE: The Ground
must be capable of carrying the same amount of current as the positive wire.
REM (Remote Trigger) - Blue Wire
This wire must be connected to a switched + 12V source. Typically, remote turn-on leads are provided at the
source unit that will turn on and off the amplifier in correspondence with the source. If the source unit does
not have a remote turn-on lead, then a switched + 12V supply must be used, like the ACC, + 12V.
13

FUSE REQUIREMENTS
Due to the small size of the PowerBass XL series amplifiers, no fuses are incorporated into the panels that
normally protect the unit from excessive current. I nstead we have included an in-line fuse holder and fuse
for this purpose.
XL-2305MX 60A
XL-4255MX BOA
It is abso l utely vital that the main power lead to the amp l ifier(s) in the system be fused within 18-inches (45cm)
of the connection to the battery. T he value of this fuse (or circuit breaker) should be no greater than the fuse
rating above.
Proper Ground Connection For UTVs, Motorcycles or Boats
FUSE HOLDER
within 18"
of Battery
"'
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+
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C
~
""
m
REMOTE TURN ON
to Accessory
On/Off Switch
:x,
C>
m z
3: 0
a,
s;;
n
"
~
"" m
Fig.7 Proper Ground Connection For UTVs, Motorcycles or Boats

RADIO
SOURCE UNIT
I I
ii
SOURCE INTERCONNECT
@ -----------05
~IB ~~N X.QVEROLPF/HPF BASSEQ O
o@rn@ @o
4011, 400Hz OdB 18d8
XL-li!3015MX
0 la-..!• Full-Dlgltol 0
I
I
I
I I
Fig.8 Input using RCA or
1 /8" Shielded Cable
I I
I L-----------,
I I
I I
[8]
~ I
AUXOUT Qo
(2nd XL Amplifier)
AUXIN
(MP3/ PORTABLE DEVICE) REMOTE LEVEL CONTROL
Choose the correct length and style of RCA interconnects for your needs. Always use high quality RCA audio
cables (not supplied) for signal connections-those with multiple layers of shielding or a twisted pair var i ety
for better noise rejection.
Be extra careful when routing your RCA audio interconnect cables. Car environments are notorious for poorly
insulated wires. This means that hiss, engine noise, and fan noise can easily be picked up through RCA
cables if run incorrectly.
Make sure that the cables for power and audio signal are not on t he same side of the vehicle and that they
do not cross each other; this will help reduce any noise that may radiate from the power cable and the signal
cable. If an audio cable is too close to a power cable, it may pick up the magnetic field generated by the
power cable, which could lead to a loss of quality in your signal.
NOTE: AUX Input is for use with portable MP3 players or an iPod ®* Use of this input will over-
ride (defeat) the RCA low level inputs.
15

HIGH INPUT PLUG
The balanced input of this XL series amplifier can receive either low RCA or high speaker lead level signals
from the source unit (radio). A high level signal can be run from the source units speaker lead outputs to
the low level RCA amplifier inputs via the PowerBass HL-AD2 wiring harness (ava ilable separately as shown
below).
HL-AD2
Wire Harness
(optional accessory)
-
-
+ - + -
Source Unit
Speaker Leads
(high level output)
--
■■
--
I I
To Amplifier

3.5mm AUX INPUT/OUTPUT WIRING
Typical 2 amplifier setup
□
0
AUXIN
(MP3/ PORTABLE DEVICE)
t I
'
Fig.10 AUX Input using 1 /8" (3.5mm)
MP3 or Portable Device as a Source
The XL Powersport Series amplifiers all feature a AUX source input. This allows you to substitute a portable
music device such as an iPOD, Smartphone, MP3 Player, etc instead of a traditional radio as your music
source. Above is a typical two amplifier system-using AUX Input and AUX Output.
You will need to use a quality shielded 1 /8-inch (3.5mm) stereo male to male audio cable for this type of set up.
Route the shielded audio cable using the same care as you would with the RCA interconnect for a traditional
source unit.
NOTE: An AUX Input is for use with portable MP3 players or an iPod ®* Use of this input will
override (defeat) the RCA low level inputs.
17

SET UP ADJUSTMENTS
INPUT Gain Adjustment
GAIN
ffi
Fig.11 GAIN Control
MIN MAX
This control allows you to match the input level of the amplifier to the output level of your head unit. Matching
the input can be accomplished in three simple steps:
1. Set the volume of GA IN on the amplifier to Min (completely counter clock wise).
2. Turn on the head unit and adjust volume to 2/3 maximum, and set the BASS and TREBLE to zero.
3. Adjust the GAIN control clockwise until the sound just begins to distort , then back off slightly to cut
distortion and operate at optimum gain.
Remember, the GAIN control is not a volume control . Ignoring the three steps above may leave you with
damaged speaker and/or a damaged amplifier.
OdB 18d8
BASS EO Control
Fig .12 Bass EQ Control
This special feature is designed to provide you more powerful sound quality, and it allows you to increase the
bass output up to + 18dB at 45Hz. Keep in mind more is not always better. Setting the control to the max (18dB)
may stress the amplifier and woofer and could result in damage. Bass EQ only works in Low Pass Mode (Rear
Channel only on XL-4255MX) . NOTE: More is not always better. By turning the BASS EQ all the way
up to 1 BdB you can overwork the amplifier and send the unit into thermal protection .
Fig.13 Low Pass Control (LPF)
40Hz 400Hz
LPF (Low Pass Filter) Adjustment
Using this volume, adjust the LPF frequency for your subwoofer speaker(s ) operatio n. Using the LPF control,
adjust the Low Pass Frequency to limit the amount of midrange going to your speakers. The X-OVER switch
position should be at "LPF".

Fig.14 High Pass Control (HPF)
40Hz 400Hz
HPF {High Pass Filter) Adjustment
When you are using coaxial or component speaker system, this allows you to adjust high-pass X-over frequency
from 40Hz to 40GHz. To get better sound quality from coaxia l or component speaker system, we recommend the
frequency should be higher than 80Hz. Make sure the X-OVER switch is positioned at "HPF". NOTE: The HPF
circuit is always active on the front channels of the XL - 4255MX.
SPECIAL CONTROLS FOR THE XL-4255MX
The following instructions apply to the model XL-4255MX only. You will not find these controls on
the other models in this series.
MODE
2CH 4CH
U Fig.15 2-4 Channel Input Mode
MODE Switch
Matches the input from the Source Unit to that of the amplifier, either 2 or 4 Channel.
This eliminates the use of "Y" adapters and provides a cleaner input signal. When the
2-Channel mode is selected, both front and rear outputs will operate with only one pair
of low level RCA inputs. Must use front Inputs .
AUX INPUT NOTE: The MOOE switch must be in the 2-Channel position in order
to use the 3.5mm AUX input
Rear X-OVER Switch
X-OVE R
HPF FULL LPF
LJlJ Fig.16 Rear Channel Crossover
Activates the Low Pass Filter (LPF). The LPF is variable from 40Hz-400Hz. FULL runs
the rear channe ls full range without any filter
19

~ Fig.11 Connection with AJ12 Jack
~
REMOTE LEVEL Controller Connection (XL-2305MX)
Your PowerBass Xtreme amp includes a Remote Level control module . To connect the Remote Level Contro l
to the amplifier, simply insert one end into the REMOTE LEVEL port. Plug the other end i nto the remote
module. Install the module within easy reach on or under your dash.
NOTE: The remote level cont r oller works with all settings HP, LP, FULL .
SPEAKER WIRING AND CONFIGURATIONS
Speaker Load
Keep in mind your PowerBass Xtreme amplifier is a high power amplifier and not a high current amplifier. In
other words The amplifier's minimum impedance is 2 ohms STEREO and 4 ohms br i dged to operate
trouble free. Lower impedance will send the amplifier into protection and possibly damage the electron i cs
inside and void the waranty .
NOTE : Know your total impedance load before you make any connections .
Speaker Wiring
Choose the correct speaker wire for your application. Most applications will require ami nimum of 16 gauge
wire. At the amplifier end , splice the speaker wires to the properly marked output leads from the amplifier.
Route these using the same precautions as you did when you ran the powe r cable . Check to make sure you ' ve
maintained proper polarity and balance.
CAUTION:
Maintaining proper impedance is critical when wiring the Full Range Digital model amplifiers . Improper
wiring can cause severe damage to BOTH the speakers and the amplifier. Detailed wiring diagrams
are supplied with all PowerBass woofers . IF YOU ARE NOT EXPERIENCED OR UNCOMFORTABLE
READING THE WIR I NG DIAGRAMS CONSULT YOUR AUTHORIZED POWERBASS DEALER BEFORE YOU
ATTEMPT TO WIRE THE SYSTEM .