Operation Manual

Functions and Controllers: MXB480 / MXB4125
FILTER - selector channel 1/2 & 3/4
Selects the desired operation mode of the amplifier.
Position HIGH PASS:
Highpass-Filter - The frequency will be limited to below,
adjustable by the HIGH PASS controller.
Position FLAT:
A Full Range Signal (Complete Frequency Range) without
filtering will be amplified.
Position LOW PASS:
Lowpass-Filter - The frequency will be limited to above,
adjustable by the LOW PASS controller.
HI INPUT - inputs for channel 1/2 & 3/4
The High level Inputs are suitable for connecting the loudspeaker wires of
the head unit, if the head unit is not equipped with pre-amplifier RCA line
outputs.
Never use the HI INPUTS and the RCA Inputs at the same time.
INPUT LEVEL - controller
Adjusts the Input Sensitivity
from 0.2 to 4 Volts.
BASS BOOST - controller
Adjust the bass boost from
0dB up to 12dB per channel pair.
POWER - LED
Indicates that the amplifier is in operation.
PROTECT - LED
If this LED lights up red, the following may
occurred:
a.) Overheating
b.) Short circuit on the loudspeakers
c.) Overloading (e.g. by too low impedance)
d.) Malfunction of the amplifier
Find more information in the chapter “Trouble
Shooting”!
INPUT - jacks for channel 1/2 & 3/4
Connect the RCA Inputs with the line outputs
of the headunit.
OUTPUT - jacks
These outputs provide a full range line output
signal to drive additional amplifiers.
INPUT
LEVEL
INPUT
LEVEL
INPUT SELECT
Select here the input signal
(2- or 4-Channel input).
HIGH PASS - controller channel 1/2 & 3/4
Adjusts the cut-off frequency of the highpass
filter. The range is adjustable from 60Hz to 1.2
kHz.
LOW PASS - controller channel 1/2 & 3/4
Adjusts the cut-off frequency of the lowpass filter.
The range is adjustable from 40Hz to 150Hz.
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