23
4 Channel Amplifier - Applications
GTS480/GTS4125
One 4 Channel Amplifier in 3 Channel Mode with
Stereo Front Speakers and Mono/Subwoofer
Interconnect cable checklist:
• Connect the head unit line outputs with good quality RCA to RCA cables to the INPUT
CH1&2 / CH3&4 of the amplifier.
• Connect the Front Speakers with the terminal block (SPEAKERS / + CH1 - and + CH2 -) of the
amplifier.
• Connect the Subwoofer with the terminal block (SPEAKERS / + BRIDGED - from
Channel 3&4) of the amplifier.
• The minimum final speaker impedance must not be below 2 Ohms Stereo and 4 Ohms Mono.
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.
•
•
•
•
•
•
Caution
Be careful not to connect speaker (-) to the ground or vehicle chassis.
FILTER SELECT (Front Speakers Channel 1&2)
•
If larger than 20 cm speakers are used, the FLAT position is recommended.
•
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.
X-OVER SELECT (Subwoofer Channel 3&4)
•
In Mono/Subwoofer-Mode select the Lowpass-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 LOW PASS control.
• In this configuration example the HIGH 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 from the Front Speakers (Channel 1&2) into “0dB” - position.
• The BASS BOOST - Control from the Subwoofer (Channel 3&4) increases the bass level at 45 Hz max. +12dB.
Caution!
Please use the Bass-Boost carefully. The additional boost may result in clipping or overload.
INPUT SELECT
• The INPUT SELECT - switch must be in “4” - position.
•
•
•
•
L
R
L
R