Protection Indicator; Lowpass Crossover Frequency Adjustment; Bass Boost - AXTON AXB20STP Bedienungsanleitung

ADJUSTMENTS
Turn-on your head-unit keeping your volume at the lowest setting. The green status LED on
the front of the AXB20STP 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. In case of internal 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 has 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.
INPUT GAIN
The input level control allows the AXB20STP 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 AXB20STP
side panel) until the bass content is perceived as sufficient and balanced.

BASS BooST

The bass boost slide switch with positions „0 dB" or "6dB" has to be played by ear. With the
slide switch set to "0 dB", the bass boost is deactivated, with position "6 dB", the frequencies
around 40 Hz are boosted – which will improve the low end extension in smaller compact
type cars. Note that with bass boost enabled, the subwoofer will have less max. dB head-
room since the very low frequencies are amplified with a higher gain and thus, woofer and
amp module reach their respective limits earlier.
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