AMPLIFIER FEATURE DESCRIPTIONS
GTR AMPLIFIERS:
Each model is capable of 4 & 2-Ohms stereo per channel, or 4-Ohms mono bridged operation except All Crunch amplifiers feature a comprehensive diagnostic system, with speaker lead short circuit, and
amplifier DC faults indicated by the red “PROTECT” LED.
the mono amps which are capable of 4, 2 and 1-Ohm loads.
CAUTION: DO NOT OPERATE ANY AMPLIFIER BELOW THE INTENDED IMPEDANCE. YOU
The input sensitivities for rated output powers are variable from 0.2 volts to 6 volts.
WILL CAUSE DAMAGE TO THE AMPLIFIER THAT WILL NOT BE COVERED UNDER THE
All crossovers are fully variable in their respective ranges.
Crossover filters are 12dB/Octave.
WARRANTY PRINTED IN THE BACK OF THE MANUAL. 2 & 4 Channel amps are capable of 4
A POWER LED indicates the powered up and turned on condition
and 2-Ohms wired stereo and 4-Ohms wired mono bridged. The GTR1000D and GTR2000D are
stable at 4-Ohms and 2-Ohms. The GTR3000D is stable at 4-Ohms, 2-Ohms and 1-Ohm.
2
The X-OVER slide switch selects the internal crossover functions:
-The input signal is routed directly to the LINE OUT RCA jacks, regardless of the X-OVER setting
simplifying daisy chaining of amplifiers.
-HPF: Selects the built in HIGH PASS filter, variable from 60 Hz to 1.2kHz.
-FULL: Bypasses all crossovers for full frequency range operation.
-LPF: Selects the built in LOW PASS , variable from 30 Hz to 250Hz.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
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.
GTR1100.2 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 Mode switch which allows you to select 2 or 4 channel
operation.
The X-OVER slide switch selects the internal crossover functions:
-The input signal is routed directly to the LINE OUT RCA jacks, regardless of the X-OVER setting
simplifying daisy chaining of amplifiers.
-HPF: Selects the built in HIGH PASS filter, variable from 60 Hz to 1.2kHz.
-FULL: Bypasses all crossovers for full frequency range operation.
-LPF: Selects the built in LOW PASS , variable from 30 Hz to 250Hz.
MODE: The mode switch allows you to choose 4 if you are providing RCA’s to inputs 1-4, or select 2 if
you are only providing RCA’s to inputs 1&2 and the amp will internally route signal to channels 3&4.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
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.
GTR1000.4 4-CHANNEL AMPLIFIERS
-The LINE INPUT signal is routed directly to the LINE OUT RCA jacks, regardless of the X-OVER
setting simplifying daisy chaining of amplifiers.
-SUBSONIC: Allows you to adjust the crossover filter from 15Hz to 55Hz.
-LPF: Allows yo to adjust the LOW PASS crossover filter from 40Hz to 150Hz.
LEVEL: Adjusts the input sensitivity from 0.2 volts to 6 volts.
BASS EQ: The Bass EQ is adjustable from 0db to 9dB.
REMOTE: This is the input jack for the remote Level control.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy
chain multiple amplifiers from one signal.
The GTR1000D and GTR2000D are stable at 4-Ohms and 2-
Ohms. The GTR3000D is stable at 4-Ohms, 2-Ohms and 1-
Ohm. Operating the amp below the loads listed can cause
damage to the amp not covered in the warranty.
GTR1000D / GTR2000D / GTR3000D
1-CHANNEL A/B CLASS MONO BLOCK AMPLIFIERS
OUTPUT INPUT
BASS
BOOST
SUB
SONIC
LOW
PASS
LEVEL
REMOTE
CONTROL
POWER
PROTECT
R R
L L
0dB 9dB 15Hz 55Hz 40Hz 150Hz 6V 0.2V
LINE INPUT
LINE OUT
CHANNEL 3 / 4
CHANNEL 1 / 2
30Hz 250Hz 60Hz 1.2KHz 0dB 9dB 6V 0.2V
30Hz 250Hz 60Hz 1.2KHz 0dB 9dB 6V 0.2V
LPF HPF BASS EQ LEVEL
LPF HPF BASS EQ LEVEL
FULL LPF HPF
X-OVER
FULL LPF HPF
X-OVER
4 2
MODE
Ch1
Ch2
Ch3
Ch4
LINE OUT LINE INPUT
R R
L L
0dB 9dB 30Hz 250Hz 60Hz 1.2KHz 6V 0.2V
BASS EQ LPF HPF LEVEL
X-OVER
HPF LPF FULL
REMOTE
CONTROL
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