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Speaker- and Audio-Connections: MXB280 / MXB2175
Subwoofer-Mode mono bridged
Connect the RCA INPUTS of the amplifier to the head unit line outputs with appropriate
RCA cables. If your head unit is not equipped with pre-amplifier RCA line outputs you
can use the optional HI INPUTS (Highlevel Inputs). Connect therefore the speaker outputs of your
head unit with the enclosed cable plug. Check the Wiring Diagram below.
Connect the speakers with the speaker ouputs (SPEAKERS/ + BRIDGED + R -) of the amplifier by
using appropriate cables.
Ensure that the total speaker impedance load is not lower than 2 Ohms per channel.
Too low speaker loads result in too high heat development and may cause the amplifier run into
protection.
FILTER - select
In the Subwoofer-Mode mono bridged the FILTER - select must be in position LOW PASS, thereby the higher frequencies will be
eliminated in the audiosignal. Set the cut-off frequency between 60Hz - 100Hz, depending on the size of the installed subwoofer
The cut-off frequency is adjustable with the LOW PASS - controller. In this configuration the HIGH PASS - controller is not used.
INPUT LEVEL - controller
• Turn the INPUT LEVEL - controller on the amplifier to 5V position.
• Turn the head unit volume controller to about 80-90% of its full setting.
• Turn the INPUT LEVEL - controller clockwise until you hear some distortion.
• Then turn back the INPUT LEVEL - controller slightly until you can hear clean sound.
REFERENCE NOTE: If this controller is cranked up too high, the amplifier produce distortions, which may cause a
“creeping death” of the amplifier (or the speakers). Usually this is called “Clipping”.
BASS BOOST - controller
• The BASS BOOST - controller adjusts the bass boost from 0db to +12dB. Caution! Please use the Bass Boost carefully.
REFERENCE NOTE: Ensure always correct polarity for all connections.
Don’t connect any speaker cables to the vehicle’s ground.
Connect the RCA
cables from the head-
unit with
the RCA inputs
(LINE LEVEL INPUT).
L R
REFERENCE NOTE: Never use the HI INPUTS and the RCA Inputs at the same time.
Subwoofer 4 - 8 Ohms
Wiring Diagram
Highlevel Inputs
White: Left Speaker -
Green: Left Speaker +
Black: Ground
Brown: Right Speaker +
Gray: Right Speaker -
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