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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

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.

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