Functions & Controls - Crunch GTR250.2 Owner's Manual

4 Channel Amplifier - Functions & Controls
INPUT MODE - Switch.
Select between 2CH, 3CH and 4CH-Mode like indicated on
the related pages.
HIGH INPUT
Accepts speaker level inputs from head units that do
not have line level (RCA) outputs. Connect the
center pole with ground chassis of your car.
CAUTION: Never use RCA-Inputs and High Input
at the same time.
CH3/4 CH1/2
R
L
LINE INPUT
LINE INPUT - Cincheingänge
This allows you to connect the amplifier with
the head unit via an RCA to RCA cable.
LEVEL - Control
CH1/2 and CH3/4 each channel pair separated
Adjusts line level (RCA) inputs from 0.2 to 5 Volts.
BASS BOOST - Control
CH1/2 and CH3/4 each channel pair separated
Allows you to adjust the bass boost from 0dB up to 12dB.
PROTECT - LED (on backpanel)
Indicates the fault operation of the amplifier. When the fault conditions (overload, excessive heat or short circuit of speaker) arise,
the protection curcuit is engaged to protect both the speakers and the amplifier against damage.
Attend in this case TROUBLE SHOOTING on page 23.
Power - LED (on backpanel)
Indicates the amplifier is in operation-mode.
GTR250.4 – GTR350.4
HIGH INPUT
LEVEL BASS BOOST HP
- - - - - - - -
+ + + + +
5V 0,2V 0dB 12dB 60Hz
CH3 CH4
LEVEL
BASS BOO ST HP
CH1 CH2
- - - - - - - -
+ + + + +
5V 0,2V 0dB 12dB 60Hz
HIGH-/LOWPASS - Control
CH1/2 and CH3/4 each channel pair separated
HP - The built in high pass filter is fully variable from 60Hz to
1200Hz (1.2KHz), with a rolloff of 12dB/octave.
LP - The built in low pass filter is fully variable from 30Hz to
250Hz, with a rolloff of 12dB/octave.
18
X-OVER - Switch
CH1/2 and CH3/4 each channel pair separated
Position HP - Highpass ist activated, the frequency of
the speakers is bounded below.
Position FULL - full range output signal
Position LP - Highpass ist activated, the frequency
of the speakers is bounded above.
X-OVER INPUT MO DE
LP
FULL
HP
1.2kHz 250Hz 2CH 4CH
30Hz
LP
3CH
LP
LP HP
FULL
X-OVER
250Hz
1.2kHz 30Hz
LINE OUTPUT
Provides a full range line level (RCA)
output that allows the use of
additional amplifiers.
LINE OUTPUT
R
L