Channel Amplifier - Applications; One 4 Channel Amplifier In 3 Channel Mode With; Stereo Front Speakers And Mono Subwoofer - Crunch Blackmaxx MXB-280 Owner's Manual

MXB-480/MXB-4100/MXB-4125/MXB-4175

One 4 Channel Amplifier in 3 Channel Mode with

Stereo Front Speakers and Mono/Subwoofer
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.
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4 Channel Amplifier - Applications

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.
Be careful not to connect speaker (-) to the ground or vehicle chassis.
Caution