Crunch GPA700.2 User manual

GPA700.2 / GPA1100.2 / GPA1800.2
GPA1000.4 / GPA1500.4 / GPA2000.4
GPA1000.1 / GPA1500.1 / GPA2000.1 / GPA3000.1
AMPLIFIERS

Ground Pounder GPA AMPLIFIERS
INDEX PAGE
Crunch is proud to introduce the finest high end car audio products available and would like to thank you for your
continued support. The Ground Pounder Series range of products have been designed to a very high level of
performance, with features unavailable in any other products. All of the amplifiers have variable crossovers built in,
with added touches such as subsonic filter, bass equalization and a bass remote control module option that allows
bass control from with in reach of the drivers seat.
To insure years of listening pleasure, all amplifiers have a built in diagnostic mode that will detect shorted speaker
leads, low impedance, dangerous high temperatures, DC shorts and will shut down the amp to help prevent
serious damage.
Amplifier Feature Descriptions..........................................................................................................................................................1
GPA700.2 / GPA1100.2 / GPA1800.2 2-CHANNEL AMPLIFIER APPLICATIONS.......................................................................2-3
GPA1000.4 / GPA1500.4 / / GPA2000.4 4 CHANNEL AMPLIFIER APPLICATIONS....................................................................4-5
GPA1000.1 / GPA1500.1 / GPA2000.1 / GPA3000.1A/B CLASS 1 CHANNEL AMPLIFIER APPLICATIONS 6
Features and Specifications..............................................................................................................................................................7
Setting Up SystemsAfter Installation For Best Performance..............................................................................................................8
Troubleshooting and Diagnostics......................................................................................................................................................9
MAXXLINK INFO............................................................................................................................................................................10
Warranty Info..................................................................................................................................................................................11
Full range stereo / Full range mono
4, 3 and 2 channel full range / 2 way active, with mono bass /
front/rear high pass using a 2 channel model for mono sub bass
..................................
Basic mono amplifier application
The contents of this manual may not be reproduced or copied with out the
written consent of MAXXSONICS USA, Inc.
Be sure to check us out at
for product reviews and tutorials for
getting the most out of your audio system.
www.youtube.com/maxxsonicsusainc

GENERAL INSTALLATION PROCEDURE
1
System Design
Installation
The success of any car stereo system relies on several factors, such as the system design, execution of the installation, and system setup. Please
remember that any system is only as good as its weakest link.
Please remember that higher power systems are not necessarily useful purely for high sound pressure levels, but also to establish a headroom capability, to
reproduce musical peaks cleanly without distortion. Lower power amplifiers will clip earlier than their more powerful cousins, and cause loudspeaker failure when
overdriven, due to the harmonics generated by a clipped signal, thus overheating voice coils.
Amplifiers should be mounted with the fins running horizontally for best convection cooling, to minimize overheating. Purchase the best quality RCA cables you can
afford, for reliability and less engine noise interference in the audio system.
General:
Power and ground connections :
TIP:
Safe connection sequence:
Power up the system:
Run the wiring so that RCA cables are at least 18“ away from power and speaker cables. Keep RCA cables away from electrical devices in the vehicle that can cause
electrical noise, such as electric fuel pumps, emission control modules and other on-board electronic modules.
Use a sufficient gauge power cable and ground cable using the chart below as reference to what size wire you require. In a multi amplifier system, add the total value
of the manufacture recommended fusing to get your total system amperage. Some applications may require multiple runs of power wire to meet the system
requirements. In multi amplifier systems it is advisable to mount a large enough fuse right at the battery, and run one or multiple +12 volt power cables to a fused
distribution block near the amplifiers. It is then a simple matter to connect the +12 volt terminal of each amplifier to the distribution block. During this process, please
ensure that the main power fuse is removed to avoid shorting the electrical system. The main fuse must be within 12” of the vehicles battery.
Ground each amplifier with as short a ground lead as possible directly to the vehicle chassis using 4 gauge wire or equivalent to the size of the amplifiers’ power wire.
Use a ground distribution block, if you wish, but it is extremely important to keep the main ground lead from this distribution block to the chassis as short as possible ,
not more than 12“. The ground connection integrity to the chassis is very important, and the best way to achieve a good, solid electrical and mechanical contact is to
use a large round crimp lug, crimped and soldered to the ground cable. The next step is to scrape the paint off the vehicle chassis , slightly larger than the ground
lug, at the connection point. Drill a clearance hole in the chassis, the same size as the lug hole, and use a bolt, spring washer and nut to securely fasten the ground
lug. Use petroleum jelly to coat the bolt/lug connection, to prevent oxidization with time.
Use the same approach when installing head units, equalizers or any audio equipment for that matter - run short individual grounds from each piece directly to
the vehicle chassis, to minimize ground loops and system noise. All power, ground and speaker connections should be crimped and soldered for reliability. Make sure
that none of the cable insulation can chafe against exposed metal in the vehicle, causing short circuits to the chassis.
After all cables are run, connect speaker wires to the speakers and amplifiers, then run and plug in RCA cables. Next, connect all power, ground, and remote turn on
leads. Now connect all +12 volt cables to the amplifier/s and distribution blocks and fuse holders. Finally, connect the main +12 volt cable to the battery, with the main
fuse removed, and we are almost ready to power up the system.
The following procedure may seem like overkill, but there is nothing more frustrating when turning on a system for the first time, and it does not work properly
immediately.
First, make sure the head unit is off, and turn all level controls to minimum (counterclockwise), including the head unit volume control. Set all equalizers to 0 dB (no
boost), and all crossover frequency controls at approximate frequencies, as recommended by the loudspeaker manufacturer. Set all input selector and crossover
switches as required for the application. Remove all amplifier fuses, and insert the main fuse at the battery. If the fuse does not blow, you can insert the fuse in one of
the amplifiers, and we are ready to turn on the system. Turn the head unit on, insert a CD, or select a radio station, and increase the head unit volume control. If the
system sounds fine, turn off the head unit, and install fuses in the remaining amplifiers, one by one, till the complete system is powered up and functioning properly.
(see the features matrix on page 9 for proper gauge cables per amplifier)
It is highly recommended that the amplifier be mounted to a board of MDF or other solid
structure using the 4 mounting screws provided. Avoid mounting the
amplifier to metal as this can introduce noise and other unwanted issues. When mounting
the amplifier, ensure that it is mounted HORIZONTALLY, as shown in the diagram above, for
optimal heat dissipation. Mounting amplifiers to speaker enclosures is not recommended as
this can cause damage to the amplifier components. When choosing a location for
mounting the amplifier, ensure that you check for clearance from wires, gas tank, electrical
devices and brake lines etc.
NOTE: This Matrix is a general rule
of thumb. Please refer to the
manufacturers specific
requirements. GPA specifications
can be found on page 9.
7-10 ft. 10-13 ft. 13-16 ft. 16-19 ft. 19-22 ft. 22-28 ft.
SYSTEM
AMPERAGE
35-50
50-65
68-85
85-105
105-125
125-150
8
6
4
4
4
2
6
4
4
2
2
0
4
4
2
2
0
0
4
4
2
2
0
0
4
4
2
2
0
0
4
2
0
0
0
0
WIRE LENGTH
WIRE GAUGE
WOOD
7
7

AMPLIFIER FEATURE DESCRIPTIONS
GROUND POUNDER GPA AMPLIFIERS:
Each model is capable of 4 & 2-Ohms stereo per channel, or 4-Ohms mono bridged operation except
the mono amps which are capable of 4, 2 and 1-Ohm loads.
The input sensitivities for rated output powers are variable from 0.2 volts to 5 volts on multi channel
models and 0.2 volts to 6-9 volts on mono models.
All crossovers are fully variable in their respective ranges
Crossover filters are 12dB/Octave.
A LED indicates the powered up and turned on condition
All Crunch amplifiers feature a comprehensive diagnostic system, with speaker lead short circuit, and
amplifier DC faults indicated by the red “ LED.
POWER
PROTECT”
CAUTION: DO NOT OPERATE ANY AMPLIFIER BELOW THE INTENDED IMPEDANCE. YOU
WILL CAUSE DAMAGE TO THE AMPLIFIER THAT WILL NOT BE COVERED UNDER THE
WARRANTY PRINTED IN THE BACK OF THE MANUAL. 2 & 4 Channel amps are capable of 4
and 2-Ohms wired stereo and 4-Ohms wired mono bridged. Some mono amps are capable of 4,
2 and 1-Ohm and others are only 4 & 2-Ohm capable. Please review the specifications page
carefully to determine the impedance capability of your chosen amplifier.
!
2
The slide switch selects the internal crossover functions:
-The input signal is routed directly to the RCA jacks, regardless of the setting
simplifying daisy chaining of amplifiers.
Selects the built in filter, variable from 60 Hz to 1.2kHz.
Bypasses all crossovers for full frequency range operation.
Selects the built in , variable from 30 Hz to 250Hz.
: The mode switch allows you to choose Stereo for full range 2 channel operation or MONO
for bridging operation
: If your radio/CD player does not have unbalanced (RCA) outputs, you can use the
HIGH level (wire) inputs.
: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
X-OVER
LINE OUT X-OVER
-HPF: HIGH PASS
-FULL:
-LPF: LOW PASS
MODE
HIGH INPUT
LINE INPUT
LINE OUTPUT
Note that the LOW PASS signal is MONO.
-In the LPF position, the HIGH PASS filter acts as a subsonic
filter.
-When the LPF mode is selected, a 0 to +9dB, at 45Hz, BASS -
EQ is also switched in.
GPA700.2 / GPA1100.2 / GPA1800.2 2-CHANNEL AMPLIFIERS
The 4 channel amps have the same features as the 2 channel models accept that there are 2 sets of
controls.
1 set for channels 1 & 2 and 1 set for channels 3 & 4.
In addition, the 4 channel models have a switch which allows you to select 2, 3 or 4 channel
operation.
The slide switch selects the internal crossover functions:
-The input signal is routed directly to the RCA jacks, regardless of the setting
simplifying daisy chaining of amplifiers.
Selects the built in filter, variable from 60 Hz to 1.2kHz.
Bypasses all crossovers for full frequency range operation.
Selects the built in , variable from 30 Hz to 250Hz.
: The mode switch allows you to choose Stereo for full range 2 channel operation or MONO
for bridging operation
: If your radio/CD player does not have unbalanced (RCA) outputs, you can use the
HIGH level (wire) inputs.
: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
Mode
X-OVER
LINE OUT X-OVER
-HPF: HIGH PASS
-FULL:
-LPF: LOW PASS
MODE
HIGH INPUT
LINE INPUT
LINE OUTPUT
Note that the LOW PASS signal is MONO.
-In the LPF position, the HIGH PASS filter acts as a subsonic
filter.
-When the LPF mode is selected, a 0 to +9dB, at 45Hz, BASS -
EQ is also switched in.
GPA1000.4 / GPA1500.4 / GPA2000.4 4-CHANNEL AMPLIFIERS
-The signal is routed directly to the RCA jacks, regardless of the
setting simplifying daisy chaining of amplifiers.
Allows you to adjust the crossover filter from 15Hz to 55Hz.
Allows yo to adjust the crossover filter from 40Hz to 150Hz.
Adjusts the input sensitivity from 0.2 volts to 6 volts.
The Bass EQ is adjustable from 0db to 9dB.
This is the input jack for the remote Level control.
: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
LINE INPUT LINE OUT X-OVER
-SUBSONIC:
-LPF: LOW PASS
LEVEL:
BASS EQ:
REMOTE:
LINE INPUT
LINE OUTPUT
CAUTION
The GPA1000.1 & GPA1500.1 mono amps are capable of 4 &
2-Ohm loads only (WARNING: they are not capable of 1-
Ohm).
The GPA2000.1 & GPA3000.1 are capable of 4, 2 & 1-Ohm
loads.
Operating the amp below the specified impedance capability
can cause damage to the amp not covered in the warranty.
GPA1000.1 / GPA1500.1 / GPA2000.1 / GPA3000.1 1-CHANNEL MONO AMPLIFIERS

GPA700.2 / GPA1100.2 / GPA1800.2 2 CHANNEL AMPLIFIER APPLICATIONS
3
FULL RANGE MONO
This is the most basic application for the GROUND POUNDER Series 2 channel
amplifiers.
Connect the to the Radio/CD with good quality RCA cables.
The switch must be in the position.
The switch must be in the position.
N/Afor full range operation.
Refer to the section
1. Interconnect cable checklist:
LINE INPUTS
2. Crossover Switch:
X-OVER FULL
MODE STEREO
3. Crossover frequency control checklist:
4. Line Level:
NOTE: Minimum final loudspeaker impedances:
4 &-2-Ohms stereo mode or 4-Ohms mono mode
“Setting up systems after installation for best performance”.
This application illustrates the basic mono bridging method for all Crunch 2 channel
amplifiers.
A MONO signal source is required, such as would be available from the mono sub bass
output of an active crossover, whether stand alone, or built into a head unit or equalizer.
Do not be tempted to connect the hot, or positive outputs, from any source
together to obtain a mono signal, as this could very well damage the output stage of that
source.
It is necessary to feed the SAME signal to both left and right inputs via a Y-adapter RCA
cable. Connect the mono speaker positive terminal to the LEFT +, and its negative
terminal to RIGHT -.
- The switch must be in the position.
- The switch must be in the position.
N/Afor full range operation.
If you are using the mono sub bass output of an active crossover, there is nothing
wrong with switching in the low pass filter in these amplifiers for a steeper low pass roll-off.
Interconnect cable checklist:
Important:
Switch setting checklist:
X-OVER FULL
MODE MONO
Crossover frequency control setting checklist:
TIP:
Minimum final loudspeaker impedance:
- 4-Ohms mono.
FULL RANGE STEREO
FULL RANGE
MONO SPEAKER
The inputs are used when the radio/CD player does not have RCA cable outputs. You can connect the radio/CD player speaker wires directly
to the amplifier via the high Level Inputs.
HIGH LEVEL
GRAY: CH 1 Speaker Input +
BROWN: CH 1 Speaker input -
Black: Chassis Ground
GREEN: CH 2 Speaker Input -
White: CH 2 Speaker Input +
ORANGE: CH 3 Speaker Input +
PINK: CH 3 Speaker input -
Black: Chassis Ground
BLUE: CH 4 Speaker Input -
YELLOW: CH 4 Speaker Input +
Use this connector for 2 CH amplifiers Use both connectors for 4 CH amplifiers
REMOTE TURN-ON
CHASSIS GROUND
TO BATTERY + 12 volts VIA FUSE
FULL RANGE
STEREO LINE INPUT
FULL RANGE
MONO LINE INPUT
VIA Y-ADAPTER
FROM MONO SOURCE
REMOTE TURN-ON
CHASSIS GROUND
TO BATTERY + 12 volts VIA FUSE
FULL RANGE
SPEAKERS

GPA700.2 / GPA1100.2 / GPA1800.2 2-CHANNEL AMPLIFIER APPLICATIONS
4
Stereo high pass with mono low-pass in a 2 way active, or bi-amplified system
In this application we will use a 2 channel amplifier for the high frequencies, and a second
one for the low frequencies, or mono sub bass. Please consult the speaker specifications
to determine maximum amplifier power requirements.
Connect the inputs of the HIGHS amplifier to a Radio/CD with good quality RCA cables.
Connect the LINE OUT of the HIGHS amplifier to the inputs of the BASS amplifier with a
stereo RCAto RCAcable.
Connect the mono speaker positive terminal to the RIGHT +, and its negative terminal to
LEFT -.
switch in the position.
switch in the position.
switch in the position.
switch in the position.
Please note that these frequency points are suggestions only. Refer to the loudspeaker
manufacturer specifications and the section
- Refer to the section
Interconnect cable checklist:
Mono bass woofer wiring:
Switch setting checklist:
- Highs amplifier: X-OVER HPF
MODE STEREO
- Lows amplifier: X-OVER LPF
MODE MONO
Crossover frequency control checklist:
Highs amplifier:
- HI PASS: 100 Hz
- LOW PASS: N/A
Lows amplifier:
- HI PASS (Subsonic filter): 10 Hz to 40 Hz
- LOW PASS: 80 Hz
Level control checklist:
Minimum final loudspeaker impedances:
- 2-Ohms per channel stereo.
- 4-Ohms mono bridged.
“Setting up systems after installation for best
performance”
“Setting up systems after installation for best performance”
FULL RANGE
STEREO LINE INPUT
STEREO
INTERCONNECT
RCA CABLE
MONO BASS
SPEAKER
REMOTE TURN-ON
REMOTE TURN-ON
CHASSIS GROUND
CHASSIS GROUND
TO BATTERY + 12 volts VIA FUSE
TO BATTERY + 12 volts VIA FUSE
FULL RANGE
SPEAKERS

GPA1000.4 / GPA1500.4/ GPA2000.4 4 CHANNEL AMPLIFIER APPLICATIONS
4 CHANNEL FULL RANGE SYSTEM
2 or 3 CHANNEL FULL RANGE SYSTEM
Here we show how to use the 4 channel amplifiers as straight forward discrete 4 channel
full range units.
- Connect the four inputs of the amplifier to a Radio/CD with quality RCAcables.
FULL
FULL
- 4 CHANNEL - Refer to the section
Interconnect cable checklist:
Switch setting checklist:
- 1/2CH X-OVER:
- 3/4CH X-OVER:
MODE:
Crossover frequency control checklist:
Channels 1/2:
- HI PASS: N/A
- LOW PASS: N/A
Channels 3/4:
- HI PASS: N/A
- LOW PASS: N/A
Level control checklist:
Minimum final loudspeaker impedances:
- 2-Ohms per channel.
“Setting up systems after installation for best performance”
Here we show how to use the 4 channel amplifiers as full range 2 or 3 channel units by
taking advantage of the mono bridging capability of all Crunch amplifiers.
The following example shows how to create a 3 channel system by mono bridging
channel pair 3 / 4. In order to create a 2 channel system, simply follow the example to
also mono bridge channel pair 1 / 2.
- Connect the inputs of channel pair 1/2 to a suitable stereo source, e.g. a head unit
with good quality RCA cables.
- A MONO signal source is required to bridge channel pair 3/4, such as would be
available from the mono sub bass output of an active crossover, whether standalone,
or built into a head unit or equalizer.
Do not be tempted to connect the hot, or positive outputs, from any source
together to obtain a mono signal, as this could very well damage the output stage of
that source.
- It is necessary to feed the SAME signal to both left and right inputs via a Y-adapter
RCA cable.
- Connect the mono speaker positive terminal to the LEFT +, and its negative terminal
to RIGHT - as shown.
FULL or HPF (high pass)
FULL or LP (low pass)
- 4 CHANNEL
If you are using the mono sub bass output of an active crossover, there is nothing
wrong with switching in the low pass filter in these amplifiers for a steeper low pass
rolloff.
- Refer to the section
Interconnect cable checklist:
Important:
Switch setting checklist:
- 1/2CH X-OVER:
- 3/4CH X-OVER:
MODE:
Crossover frequency control checklist:
Channels 1/2:
- HI PASS: N/A
- LOW PASS: N/A
Channels 3/4:
- HI PASS: N/A
- LOW PASS: N/A
TIP:
Level control checklist:
Minimum final loudspeaker impedances:
- 2-Ohms per channel in stereo mode.
- 4-Ohms mono bridged.
“Setting up systems after installation for best performance”
5
MONO
OR SUB BASS
SPEAKER
REMOTE TURN-ON
REMOTE TURN-ON
CHASSIS GROUND
CHASSIS GROUND
TO BATTERY + 12 Volts VIA FUSE
TO BATTERY + 12 Volts VIA FUSE
FULL RANGE
SPEAKERS
FULL RANGE
SPEAKERS
FULL RANGE
LINE INPUTS
MONO LINE
INPUTS
FULL RANGE
STEREO LINE
INPUTS

6
Basic application
These sub bass amplifiers can be used in any of the bi-amplification systems described in
this manual, replacing the 2 channel amplifiers as per the illustrations.
Connect the inputs to a suitable source, e.g. a head unit with good quality RCA cables.
Connect the LINE OUT to the inputs of the system highs amplifier.
Use at least #12 gauge speaker wiring. The amps have dual speaker terminals,
simplifying the hookup of multiple speakers
Refer to the section
Interconnect cable checklist:
Crossover frequency control checklist:
LOW PASS: 40Hz to 150Hz
SUBSONIC:15 Hz to 55 Hz
BASS EQ: 0 to +9dB
Level control checklist:
Minimum final loudspeaker impedance: The GPA1000.1 & GPA1500.1 are 4 & 2-
Ohm stable only (not 1-Ohm stable).
The GPA200.1 & GPA3000.1 are 4, 2 & 1-Ohm stable.
“Setting up systems after installation for best performance”
FULL RANGE
STEREO LINE INPUT
NOT USED
Y-ADAPTOR
Note: You can use the Radio/CD designated mono line output or a full range stereo line output.
For full range stereo line output, you will need an optional “Y-Adaptor” as shown.
GPA1000.1 / GPA1500.1 / GPA2000.1 GPA3000.1 1 CHANNEL APPLICATION
PARALLEL MONO
SUBWOOFERS
2-OHMS EACH MINIMUM
MONO
SUBWOOFER
REMOTE TURN-ON
CHASSIS GROUND
TO BATTERY + 12 Volts VIA FUSE
DESIGNATED
MONO OUTPUT
FROM HEAD UNIT

7
GPA700.2 GPA1100.2 GPA1800.2 GPA1000.4 GPA1500.4 GPA2000.4
MAXX Output Power Rating
4 Ohm 2 x 175 2 x 225 2 x 450 4 x 125 4 x 185 4 x 450
2 Ohm 2 x 350 2 x 550 2 x 900 4 x 250 4 x 375 4 x 900
1 Ohm n/a n/a n/a n/a n/a n/a
Mono Bridged at 4 Ohm 1 x 700 1 x 1100 1 x 1800 2 x 500 2 x 750 2 x 1000
Mono Bridged at 2 Ohm n/a n/a n/a n/a n/a n/a
Mono Bridged at 1 Ohm n/a n/a n/a n/a n/a n/a
General Specifications
Frequency Response -3dB 15Hz - 45KHz 15Hz - 45KHz 15Hz - 45KHz 15Hz - 45KHz 15Hz - 45KHz 15Hz - 45KHz
Total Harmonic Distortion 0.05% 0.05% 0.05% 0.05% 0.05% 0.05%
Variable Input Gain Control 0.2V - 6V 0.2V - 6V 0.2V - 6V 0.2V - 6V 0.2V - 6V 0.2V - 6V
Protection (short / thermal / overload) Yes Yes Yes Yes Yes Yes
Crossover Operation
Variable Hi-Pass 60Hz - 1.2KHz 60Hz - 1.2KHz 60Hz - 1.2KHz 60Hz - 1.2KHz 60Hz - 1.2KHz 60Hz - 1.2KHz
Variable Low-Pass 30Hz - 250Hz 30Hz - 250Hz 30Hz - 250Hz 30Hz - 250Hz 30Hz - 250Hz 30Hz - 250Hz
Variable Subsonic Filter n/a n/a n/a n/a n/a n/a
Bass EQ at 45Hz 0dB - 9dB 0dB - 9dB 0dB - 9dB 0dB - 9dB 0dB - 9dB 0dB - 9dB
Line Out Yes Yes Yes Yes Yes Yes
Hi Input Yes Yes Yes Yes Yes Yes
Unbalanced Input (RCA Jack) Yes Yes Yes Yes Yes Yes
Balanced Input (Din Jack) No No No No No No
Phone Jack for Remote Control No No No No No No
Remote Control Accessory
Miscellaneous
Power Terminal 4-Ga. 4-Ga. 4-Ga. 4-Ga. 4-Ga. 4-Ga.
Speaker Terminal 10-Ga. 10-Ga. 10-Ga. 10-Ga. 10-Ga. 10-Ga.
Fuse Number & Size 1 x 20 amp 2 x 20 amp 2 x 25 amp 2 x 10 amp 2 x 20 amp 2x 25 amp
Line Out L x H x W 9.21" x 2.23" x 9.1" 12.36" x 2.23" x 9.1" 13.94" x 2.23" x 9.1" 11.18" x 2.23" x 9.1" 12.36" x 2.23" x 9.1" 13.94" x 2.23" x 9.1"
4 CHANNEL
FEATURES
2 CHANNEL
GPA1000.1 GPA1500.1 GPA2000.1 GPA3000.1
MAXX Output Power Rating
4 Ohm 1 x 500 1 x 750 1 x 500 1 x 750
2 Ohm 1 x 1000 1 x 1500 1 x 1000 1 x 1500
1 Ohm n/a n/a 1 x 2000 1 x 3000
Mono Bridged at 4 Ohm n/a n/a n/a n/a
Mono Bridged at 2 Ohm n/a n/a n/a n/a
Mono Bridged at 1 Ohm n/a n/a n/a n/a
General Specifications
Frequency Response -3dB 15Hz - 150Hz 15Hz - 150Hz 15Hz - 150Hz 15Hz - 150Hz
Total Harmonic Distortion 0.05% 0.05% 0.05% 0.05%
Variable Input Gain Control 0.2V - 6V 0.2V - 6V 0.2V - 6V 0.2V - 6V
Protection (short / thermal / overload) Yes Yes Yes Yes
Crossover Operation
Variable Hi-Pass n/a n/a n/a n/a
Variable Low-Pass 40Hz- 150Hz 40Hz- 150Hz 40Hz- 150Hz 40Hz- 150Hz
Variable Subsonic Filter 15Hz - 55Hz 15Hz - 55Hz 15Hz - 55Hz 15Hz - 55Hz
Bass EQ at 45Hz 0dB - 9dB 0dB - 9dB 0dB - 9dB 0dB - 9dB
Line Out Yes Yes Yes Yes
Hi Input No No No No
Unbalanced Input (RCA Jack) Yes Yes Yes Yes
Balanced Input (Din Jack) No No No No
Phone Jack for Remote Control Yes Yes Yes Yes
Remote Control Accessory
Miscellaneous
Power Terminal 4-Ga. 4-Ga. 4-Ga. 4-Ga.
Speaker Terminal 10-Ga. 10-Ga. 10-Ga. 10-Ga.
Fuse Number & Size 2 x 20 amp 2 x 25 amp 3 x 25 amp 100 amp ANL
Line Out L x H x W 13.94" x 2.23" x 9.1" 14.72" x 2.23" x 9.1" 17.87" x 2.23" x 9.1" 19.84"x 2.23" x 9.1"
MONO BLOCK
FEATURES
2 x 60 amp

8
SETTING UP SYSTEMS AFTER INSTALLATION FOR BEST PERFORMANCE
GPA1000.1 / GPA1500.1 / GPA2000.1 / GPA3000.1
General:
Subsonic:
Bass EQ:
Low Pass:
Level Control Setup:
LEVEL
LEVEL
Sit back and enjoy the music!
At this point you are ready to get more specific on the settings for your amplifier.
This setting acts as a low frequency cut off for your system bass reproduction. The point that you set it at cuts off any frequencies from reproduction beyond this point. The 12 o’clock
position is a great starting point. EXAMPLE: If you adjust the Subsonic to 25Hz, the amplifier will not play frequencies below 25Hz but will play frequencies from 25Hz to the chosen Low
Pass frequency.
This setting is a fixed bass boost at 45Hz that is variable from 0-9dB. This feature provides impact to your bass, but if not adjusted correctly, it can be over used and cause damage to
your subwoofers and amplifiers. It is best to slowly turn this setting clockwise until the desired punch is felt. It is not recommended to exceed the 12 o’clock position unless listening at a
low volume or a low recording quality as this can result in high distortion and possibly clipping.
The Low Pass control acts as a ceiling and doesn’t allow frequencies to the right of the desired setting to be reproduced. The 12 o’clock position is a great starting point. EXAMPLE: If you
adjust the Low Pass to 80Hz, the amplifier will not play frequencies above 80Hz but will play frequencies from 80Hz to the chosen Subsonic frequency.
Ensure that the Level is turned completely to the left prior to turning the system on. Next you should insert a CD or cassette that you are familiar with to use as a reference, and turn the
head unit volume control to about 80% of its full setting. The system sound level will of course be very low, and the following procedures will help you to match the amplifier input
sensitivities properly to the head unit output signal level.
It is important to match the amplifier input sensitivity to the Radio/CD output sensitivity. This can be located in the Radio/CD manual.
If the Radio/CD output sensitivity is 2 volts, then adjust the amplifier input to 2 volts.
If you are not sure what the Radio output sensitivity is, follow these general guide lines:
Turn the level control up slowly, till you hear distortion, then back off a few degrees on the control. If at any point your amplifier goes into protection, you will need to turn the Level to the
left a bit and then try again. If you reach a point where the output does not increase, stop turning the Level control to the right as the amplifier/subwoofer combo has reached its maxx
output in this application.
GPA700.2 / GPA1100.2 / GPA1800.2 / GPA1000.4 / GPA1500.4 / GPA2000.4
General:
High Pass:
Bass EQ:
Low Pass:
Level Control Setup:
LEVEL
LEVEL
At this point you are ready to get more specific on the settings for your amplifier.
-When in Hi Pass operation, this setting acts as a low frequency cut off for your system reproduction. The point that you set it at cuts off any frequencies from reproduction beyond this
point. The 12 o’clock position is a great starting point. EXAMPLE: If you adjust the High Pass to 100Hz, the amplifier will not play frequencies below 100Hz but will play frequencies from
100Hz to the chosen Low Pass frequency.
-When in Low Pass/Bandpass operation, this setting acts as a low frequency cut off for your system reproduction aka Subsonic Filter. The point that you set it at cuts off any frequencies
from reproduction beyond this point. The 12 o’clock position is a great starting point. EXAMPLE: If you adjust the High Pass to 25Hz, the amplifier will not play frequencies below 25Hz
but will play frequencies from 25Hz to the chosen Low Pass frequency.
-When in Flat/Full operation, the High Pass crossover is bypassed.
This setting is a fixed bass boost at 45Hz that is variable from 0-9dB. This feature provides impact to your bass, but if not adjusted correctly, it can be over used and cause damage to
your speakers and amplifiers. It is best to slowly turn this setting clockwise until the desired punch is felt. It is not recommended to exceed the 12 o’clock position unless listening at a low
volume or a low recording quality as this can result in high distortion and possibly clipping.
The Low Pass control acts as a ceiling and doesn’t allow frequencies to the right of the desired setting to be reproduced. Turning the potentiometer all the way to the right is a great
starting point. EXAMPLE: If you adjust the Low Pass to 120Hz, the amplifier will not play frequencies above 120Hz but will play frequencies from 120Hz to the chosen Hi Pass or
Subsonic frequency.
-When in Hi Pass operation, this setting is bypassed.
Ensure that the Level is turned completely to the left prior to turning the system on. Next you should insert a CD or cassette that you are familiar with to use as a reference, and turn the
head unit volume control to about 80% of its full setting. The system sound level will of course be very low, and the following procedures will help you to match the amplifier input
sensitivities properly to the head unit output signal level.
It is important to match the amplifier input sensitivity to the Radio/CD output sensitivity. This can be located in the Radio/CD manual.
If the Radio/CD output sensitivity is 2 volts, then adjust the amplifier input to 2 volts.
If you are not sure what the Radio output sensitivity is, follow these general guide lines:
Turn the level control up slowly, till you hear distortion, then back off a few degrees on the control. If at any point your amplifier goes into protection, you will need to turn the Level to the
left a bit and then try again. If you reach a point where the output does not increase, stop turning the Level control to the right as the amplifier/speaker combo has reached its maxx
output in this application.

TROUBLESHOOTING A SYSTEM
9
The key to finding the problem in a misbehaving sound system is to isolate parts of that system in a logical fashion to track down the fault.
Description of the PROTECT system built into all GROUND POUNDER amplifiers
Amplifier heatsink overheating
Low output power
Fuses blowing
System does not turn on
The diagnostic system will shut down the amplifier, until reset by turning the head unit off, and back on. This state of affairs will be indicated by the front panel PROTECT
LED lighting up under the following conditions:
1 -Asort circuit on the loudspeaker leads.
2 -An internal amplifier fault that causes a DC offset on the loudspeaker output.
Should the amplifier go into protect mode, simply disconnect all RCAand speaker leads, while keeping +12 volt, power ground and remote leads connected.
1. Now turn the amplifier back on, and if the diagnostic LED lights, the amplifier has an internal fault.
2. If not, plug the RCAcables back, and reset the amplifier. If it goes into diagnostic now, the fault lies in the input, either with bad cables or source unit.
3. If the amplifier seems fine with RCA cables plugged in, connect the speakers, one at a time, and if one of the speakers or its wiring is faulty, it will activate the diagnostic
system.
The amplifiers will shut down when the heatsink temperature reaches 80 degrees centigrade, and turn back on once the unit has cooled down below that point.
1 - Inadequate cooling - relocate or remount to provide better natural airflow over the fins.
2 - Driving high power levels into low impedances - back off on the volume control, and/or make sure you are not loading the amplifier with less than the recommended
loudspeaker impedance.
1 - Check that level controls have been set up properly.
2 - Make sure that the battery voltage, as measured at the amplifier’s +12 volt and ground terminals, is 11 volts or more.
3 - Check all +12 volt and ground connections.
1 - The use of loudspeaker impedances below the recommended minimums will draw more current - check.
2 -Ashort on the main +12 volt cable from the battery to the vehicle chassis will cause the main fuse to blow.
3 - If an amplifier fuse blows continually, with only +12 volt, ground and remote leads connected, the amplifier may be faulty.
1 - Check all fuses.
2 - Check all connections.
3 - Measure the +12 volt and remote turn on voltages at the amplifier terminals. If these are non existent or low, take voltage measurements at fuse holders, distribution
blocks, the head unit’s +12 volt and remote leads to localize the problem.
Causes of overheating:
Noise problems
Hiss, or white noise
Electrical interference
System noise can be divided into two categories, hiss, and electrical interference.
1 - High levels of white noise usually occurs when amplifier level controls are turned up too high - readjust according to the procedures in section
2 -Another major problem that can cause excessive hiss, is a noisy head unit - unplug the amplifier input RCAcables, and if the hiss level reduces, the source unit is at fault.
The inside of an automobile is a very hostile electrical environment. The multitude of electrical systems, such as the ignition system, alternator, fuel pumps, air conditioners,
to mention just a few, create radiated electrical fields, as well as noise on the +12 volt supply and ground. Remember to isolate the problem - first unplug amplifier input RCA
cables, if the noise is still present, check the speaker leads, if not, plug the RCA’s back, and investigate the source driving the amplifier, one component at a time.
1 - This problem could be caused by radiation pickup of RCAcables too near to a fuel pump or a distributor, for instance, - relocate cables.
2 - Check that the head unit ground is connected straight to the vehicle chassis, and does not use factory wiring for ground.
3 - Try to supply the head unit with a clean +12 volt supply directly from the battery +, instead of using a supply from the in dash wiring/fusebox.
This type of noise can be more difficult to pinpoint, but is usually caused by some kind of instability, causing oscillations in the system.
1 - Check all connections, especially for good grounds.
2 - Make sure that no speaker leads are shorting to exposed metal on the vehicle chassis.
3 -RCAcables are notorious for their problematic nature, so check that these are good, in particular the shield connections.
”Setting up systems after
installation for best performance”
Aticking or whine that changes with engine RPM:
Aconstant whine:

10
Biggest POWER systems
Moderate POWER systems
Smaller POWER systems
V3 Products, Level 10 Performance + 1
Year Warranty
V1 Products, Level 5 Performance
V2 Products, Level 7 Performance + 6
Month Warranty

11
Maxxsonics Limited Warranty
As the manufacturer of Maxxsonics, Autotek, Crunch, MB Quart and Hifonics car audio products,
Maxxsonics USA Inc. Warrants to the original consumer purchaser the amplifier to be free from
defects in material and workmanship for one (1) Year from date of purchase.
All other parts and accessories of the system are warrantied to be free from defects in
material and workmanship for one (1) year from date of purchase. Maxxsonics will
repair or replace at it’s option and free of charge during the warranty period, any system
component that proves defective in materials and workmanship under normal installation,
use and service provided that the product is returned to the authorized Maxxsonics dealer
from where it was purchased. A photo copy of the original receipt must accompany the
product being returned.
Valid purchase receipts will contain the name and address of the authorized reseller.
Any damage to the product as a result of misuse, abuse, accident, incorrect wiring,
improper installation, alteration of date code or bar code labels, revolution, natural
disaster, or any sneaky stuff because someone messed up, repair or alteration out side
of our factory or authorized service centers and any thing else you have done that you
should not have done is not covered.
This warranty is limited to defective parts and specifically excludes any incidental
or consequential damages connected therewith. This warranty is not to be construed
as an insurance policy.
Warranty on installation labor, removal, re-installation and freight charges are not the
responsibility of Maxxsonics USA Inc.
Warranty products damaged as a result of insufficient or improper packing materials
are not covered by this limited warranty and such damaged product will be returned
“as is” at the expense of the owner.
Designed and Engineered in the USA
www.maxxsonics.com
CRUNCH