Operation; Level Control - AXTON AXB25P Bedienungsanleitung

oPeratIoN

Turn-on your head-unit keeping your volume at the lowest setting. The green status LED on
the front of the AXB25P amp-module should light up now. If not, turn-off your head-unit and
re-check all wiring to and from the amplifier for missing or faulty connections.
ProteCtIoN INDICator
This active subwoofer is equipped with an overload protection. Due to short circuit or
increased temperature, the overload protection is activated, and the red LED indicator
comes on. Through this the amplifier is protected against damage. In case of the thermal
protection a certain cooling time must be allowed after which the amp-module will resume
operation.
loWPass CrossoVer freQueNCY aDJustmeNt
The lowpass cut-off frequency setting, marked as „LPF" on the active subwoofer, depends
on the dimension of the vehicle and the mounting location. As a rule of thumb, settings in
a range between 80 to 100 Hz will render best sonic results. For an intermediate lowpass
crossover setting to attempt input gain and phase-shift control adjustments, go for a VR-pot
set to approx. 80 Hz – and after input gain and phase have been adjusted, it is advisable to
fine tune the lowpass crossover frequency for best possible sound quality.
Note: In general, setting the lowpass crossover frequency too low, will result in a weak
and muddy sounding bass, while setting this crossover frequency too high will result in a
'booming' bass sound and reduced low end extension.

leVel CoNtrol

If you plan using the Bass boost remote control, please turn the adjustment knob counter-
clockwise in its minimum position, before input gain adjustments are done. The input level
control allows the AXB25P to be matched to almost any car, to work well within a wide range
of output levels. The following procedure can be applied: Turn on the head unit and adjust
the volume level to an elevated but still sane output. Now using a screwdriver, increase
the GAIN potentiometer by turning it clockwise (on the AXB25P side panel) until the bass
content is perceived as sufficient and balanced.
PHase-sHIft
The AXB25P comes with a phase-shift slide switch (designated with "0-180°") on the
side-panel of the active subwoofer. This switch allows to adjust the acoustic phase of the
AXB25P's bass output, to match with OE speaker systems or aftermarket audio compo-
nents installed in the vehicle. One position of the slide switch will (subjectively) increase the
bass level that is perceived in the car, while the other switch position seems to decrease
bass output. The correct position of the "0-180°" switch is the one, that gives you more bass.
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