21
4 Channel Amplifier - Applications
GTS480/GTS4125
Connect RCA outputs from
head-unit with RCA inputs
(INPUT CH1/2 and CH3/4).
One 4 Channel Amplifier with Front-/Rear Speakers
Interconnect cable checklist:
• Connect the head unit line outputs with good quality RCA to RCA cables to the INPUTCH1&2 /
CH3&4 of the amplifier.
• Connect the Front-/Rear Speakers with the terminal blocks (SPEAKERS / + CH1 -,
+ CH2 -, + CH3 -, and + CH4 -) of the amplifier.
• The minimum final speaker impedance must not be below 2 Ohm per channel. 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.
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FILTER SELECT (CH1/2 & CH3/4)
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If larger than 20 cm speakers are used, the FLAT position is recommended.
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For all smaller speakers (Ø8.7cm - 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 HIGH PASS control.
• In this configuration example the LOW PASS control is not used.
INPUT LEVEL (CH1/2 & CH3/4)
• Turn the INPUT LEVEL controls on the amplifier to 4V position.
• Turn the head unit volume control to about 80-90% of its full setting.
• Turn the INPUT LEVEL controls clockwise until you hear some distortion.
• Then turn back the INPUT LEVEL controls slightly until you can hear clean sound.
BASS BOOST (CH1/2 & CH3/4)
• Turn the BASS BOOST control into “0dB” - position.
INPUT SELECT
• The INPUT SELECT - switch must be in “4” - position.
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Caution
Be careful not to connect speaker (-) to the ground or vehicle chassis.
Gray: Left S
Brown: Left Speaker -
B l a c k : G r o u n d
White: Right S
Green: Right Speaker -
HI INPUT
L
R
L
R
Rear-Speakers 2 - 8 Ohms
Front-Speakers 2 - 8 Ohms