4-Channel-Mode: 2 Frontspeakers / Stereo & 2 Rearspeakers /Stereo - Crunch GTR250.2 Owner's Manual

4 Channel Amplifier - Speaker & RCA-Connection
4-Channel-Mode: 2 Frontspeakers / Stereo & 2 Rearspeakers /Stereo
X-OVER SWITCH & CONTROL (CH1/2 & CH3/4)
• If larger than 20 cm speakers are used, the "FULL" position is recommended.
For all smaller speakers (8.7cm - 16cm) the "HP"-Position (HIGH PASS) is recommended, which eliminates the lowest
ï frequencies and protects the speakers from damage. Set the crossover-frequency between 60Hz - 150Hz, depending of the size
ï 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.
LEVEL (CH1/2 & CH3/4)
• Turn the LEVEL controls on the amplifier to 5V position.
• Turn the head unit volume control to about 80-90% of its full setting.
• Turn the LEVEL controls clockwise until you hear some distortion.
• Then turn back the LEVEL controls slightly until you can hear clean sound.
BASS BOOST (CH1/2 & CH3/4)
• Turn the BASS BOOST control into "0dB" - position.
INPUT MODE (CH1/2 & CH3/4)
• The INPUT MODE switch must be in "CH4" - position.
CH3 / CH4 CH1/ CH2
Connect RCA outputs
from head-unit with
RCA inputs (LINE
INPUT CH1/2 & CH3/4).
REV. 2
GTR250.4 – GTR350.4
Cable connection
• Connect 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 (CH1 +/- und CH2 +/ - SPEAKER) and
(CH3 +/- und CH4 +/ - SPEAKER) of the amplifier.
• The minimum final speaker impedance must not be below 2 Ohm 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.
Please avoid to connect speaker (-) to the ground or vehicle chassis.
19
Caution
HIGH LEVEL INPUTS
CH1/2 & CH3/4
Green: Left Speaker -
White: Left Speaker +
Black: Ground
Brown: Right Speaker +
Gray: Right Speaker -
Rearspeakers 2 - 8 Ohms
Frontspeakers 2 - 8 Ohms