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4 Channel Amplifier - Functions & Controls
GTR440.4 – GTR640.4
18
CH3
LINE INPUT
OUTPUT
L
R
LINE
BASS REMOTE
CH1
CH4
CH2
PROTECT PWR
BPF
4V
30Hz
150Hz
0dB 12dB
BASS B OOST
0.2V
1.2kHz
10Hz
HIGH P ASSLOW P ASS
LEVEL I NPUT
BPF
4V
30Hz
150Hz
0dB 12dB
0.2V
1.2kHz
10Hz
4CH 2CH
INPUT MODE
OFF ON
TWIN SUB
BASS B OOST
HIGH P ASSLOW P ASS
LEVEL I NPUT
CH3 / CH4
CH1 / CH2
X- O VER
LP/BP HP
FULL
X- O VER
LP/BP HP
FULL
BASS BOOST - Control CH1/2 and CH3/4
Allows you to adjust the bass boost from
0dB up to 12dB at 45 Hz.
HIGH-/LOWPASS - Control CH1/2 and CH3/4
HIGH PASS - The built-in high pass filter is fully variable from
10Hz to 1200Hz and cut-off the lower frequencies.
By choosing the LP/BP mode on the X-OVER switch, the
BANDPASS-Mode is activated. By adjusting the HIGH PASS
Contoller, the Subsonic-Frequency (Lower Frequency cut-off)
ist adjustable.
LOW PASS - The built-in low pass filter is fully variable from
30Hz to 150Hz and cut-off the higher frequencies.
X-OVER - Switch CH1/2 and CH3/4
Select the desired Operation-Mode.
Position HP - High pass filter ist activated and the
frequency range is cut-off below.
Position FULL - Full range output signal
Position LP/BP - Low pass filter ist activated and the
frequency range is cut-off above.
LINE INPUT - RCA
Allows to connect the
amplifier with the head
unit via RCA cable.
INPUT MODE - Switch
If on LINE INPUT only
CH1/2 is occupied,
switch
to the "2CH" Position. If
all four jacks are in use,
switch to "4CH" position.
PROTECT - LED
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 the speakers and the amplifier against damage.
Attend in this case TROUBLE SHOOTING on page 22.
LEVEL INPUT - Control
CH1/2 and CH3/4
Adjusts the line level (RCA)
inputs from 0.2 to 4 Volts.
POWER - LED
Indicates the
amplifier is in
operation-
mode.
BASS REMOTE - Terminal
Terminal jack for the supplied BASS
REMOTE. With this remote you are able
to adjust the Bass Level for example
from the driver's seat.
OUTPUT- RCA
Provides a full range line
level (RCA) output that
allows the use of
additional amplifiers
TWIN SUB - Switch
When this Switch is
set to "ON" the same
adjusted Parameters
of CH 3/4 for HIGH
PASS, LOW PASS
and BASS BOOST
are taking effect on
CH1/2. Only the INPUT
LEVEL must be
adjusted. This is only
suitable for an operation
with 2 subwoofers.
18


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