Crunch GPA1000.1, Instruction Manual, Page: 4 / 14

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