Bedienungsanleitung Axton AB20A (Seite 15 von 20) (Deutsch, Englisch)

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Attach the ground cable to the GND terminal on the backside of the active subwoofer. In

most cases it will be best to keep the ground cable („-12V“) as short as possible, i.e. to

find a chassis contact very close to the active sub. The ground power wire must have the

same cross-section as the positive power cable. The contact point where the ground wire is

attached to, must be solid and clean, i.e. free from rust or paint!

4.2 RCA & REMOTE WIRES

Carefully run the RCA interconnect and the amp- or antenna-remote wire from your headunit

to the respective inputs on your active sub. The audio signal cables should always be routed

completely separate from the power cables.

5. CROSSOVER ADJUSTMENTS

5.1 LOWPASS X-OVER FREQUENCY

The lowpass cut-off frequency setting, marked as „CROSSOVER“ on the amp-module,

depends on some variables, i.e. the bass response of the loudspeakers installed in the car.

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. 12 o’clock – 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 cross-over 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.

5.2 INPUT GAIN

To reach a maximum in dynamic response from each individual head-unit/amplifier/speaker

combination, it is important to set the respective input level controls („GAIN“) of the amp-

module correctly.

Before you start, you MUST set all tone controls (Bass, Mid, Treble, Loudness etc.) and the

fader on the head unit to their neutral or center positions.

Switch on your headunit, and set the playback level to a medium volume.

Now turn up the input “GAIN” on the front side of the active subwoofer, until you hear

enough bass volume. Close the trunk of your car, listen to the result and fine tune the GAIN

level by turning the pot down or up, until a good tonal overall balance with enough bass is

achieved.

5.3 PHASE-SHIFT

The phase shift function of the AB20A can not be deactivated, it is permanently in the signal

chain. The phase-shift control enables you to match the acoustical phase relations of the

active subwoofer and the speaker system of your car. A good match of the acoustical phase

between subwoofer and the system in the front doors will give you the impression of bass

coming from a place in front of you. This setting must be played entirely by ear.

AB20A Manual D+E.indd 15 04.08.2006 15:57:34 Uhr

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