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4 Channel Amplifier - Applications
MXB-480/MXB-4100/MXB-4125/MXB-4175
One 4 Channel Amplifier in Mono/Subwoofer Mode with two Subwoofers
Subwoofer 4 - 8 Ohm
Subwoofer 4 - 8 Ohms
Subwoofer 4 - 8 Ohms
FILTER SELECT (CH1/2 & CH3/4)
•
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 Subwoofers.
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)
• The BASS BOOST - Control 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 “2” - position.
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
Connect RCA outputs from
head-unit with RCA inputs
(INPUT CH1/2).
Caution
Be careful not to connect speaker (-) to the ground or vehicle chassis.
Interconnect cable checklist:
• Connect the head unit line outputs with good quality RCA to RCA cables to the INPUT
CH1&2 of the amplifier.
• Connect the Subwoofers with the terminal blocks (SPEAKERS / + BRIDGED - from
Channel 1&2 and + BRIDGED - from Channel 3&4) of the amplifier.
•The minimum final speaker impedance must not be below 4 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.
