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4 Channel Amplifier - Speaker & RCA-Connection
GTR250.4 – GTR350.4
CH3/4
CH1/2
LINE INPUT
R
R
L
L
LINE OUTPUT
LEVEL
5V
60Hz
60Hz
30Hz
30Hz
250Hz
250Hz
0dB
0dB
12dB
12dB
BASS BOOST
INPUT MO DE
2CH
4CH
X-OVER
0,2V
1.2kHz
1.2kHz
LP
BASS BOOST
LEVEL
5V
0,2V
X-OVER
HP
FULL
HP
LP
HP
LP
CH3/ CH4
CH1/CH2
3CH
LP
HPFULL
CH3 CH4
CH1 CH2
HIGH
INPUT
+++
---
++
--
-----
+++++
+++++
-----
-----
KE
S
P
E
A
R
P
O
UT
U
T
e
1
3
2
2
5
0
1
7
F
U
S
E
RI
E
D
B
DG
L
R
G
N
D
E
R
M
12
V
W
P
O
E
R
P
IN
U
T
B
R
G
E
D
I
D
L
R
P
RO
E
T
C
T
PO
W
E
R
Speakers 2 - 8 Ohms
Subwoofer 4 - 8 Ohms
Connect RCA outputs from
head-unit with RCA inputs
(LINE INPUT CH1/2 & CH3/4).
21
Caution
Please avoid to connect speaker (-) to the ground or vehicle chassis.
3-Channel-Mode: 2 Speakers/Stereo & 1 Subwoofer / Mono
Cable connection
• Connect the INPUT of the amplifier to the head unit line output with good quality RCA cables.
If your head unit doesn't have RCA Outputs you can connect the Speaker Outputs of the head
unit with the HIGH INPUT of the amplifier.
• Connect the speakers with the terminal block (CH3 +/- & CH4 +/ - SPEAKER and
the subwoofer with CH1/2 + BRIDGED - SPEAKER of the amplifier.
• The minimum final speaker impedance must not be below 2 and 4 Ohm (subwoofer) per
channel pair. Too low speaker loads result in too high heat dissipation and may cause the
amplifier run into protection.
• Please observe speaker channel and polarity as printed by the speaker terminal block.
Incorrect phasing of the speakers results in total loss of bass response.
XOVER SWITCH & CONTROL (CH3/4)
If larger than 20 cm speakers are used, the "FULL" position is recommended.
For all smaller speakers (8.7cm - Ø16cm) the Highpass-Position (HIGH PASS) is recommended, which eliminates the lowest
frequencies and protects the speakers from damage. Set the crossover-frequency between 60Hz - 150Hz, depending of the size
of the installed speakers. The Highpass adjustment can be done with the "HP" (HIGH PASS) control.In this configuration example
the "LP" LOW PASS control is not used.
X-OVER - SWITCH & CONTROL (CH1/2)
• Select at X-OVER "LP"-Position (LOW PASS), which eliminates the higher frequencies. The recommended crossover
frequency ranges between 60 - 100Hz, depending on the size and response of the Subwoofer. The Lowpass adjustment can be
done with the "LP" (LOW PASS) control. In this configuration example the "HP" (HIGH PASS) control is not used.
LEVEL CONTROL (CH1/2 & CH3/4)
• Turn the LEVEL control on the amplifier to "5V" position.
• Turn the head unit volume control to about 80-90% of its full setting.
• Turn the LEVEL control clockwise until you hear some distortion.
• Then turn back the LEVEL control slightly until you can hear clean sound.
BASS BOOST (only CH3/4)
• The BASS BOOST - Control increases the bass level at 45 Hz from 0dB up to 12dB. Caution! Please use the Bass-Boost carefully.
INPUT MODE
• The INPUT MODE switch must be in “4CH” - position (Stereo-Signal on Subwoofer) or
"3CH" - position (Mono-Signal on Subwoofer).
ï
ï
++
--
Attend the configuration of the
HIGH LEVEL INPUTS
CH1/2 & CH3/4 on page 20.
REV. 2
21


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