Operation Manual

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2.2 FRONT PANEL CONTROLS

7 PHASE SHIFT CONTROL

Phase control potentiometer for the phase adjustment of the active sub, to match the

acoustical phase of the bass output with other speakers installed in the vehicle

8 CROSSOVER FREQUENCY CONTROL

Crossover control potentiometer to adjust the lowpass frequency of the electronic

crossover with 12dB/oct. between 60 to 120Hz

9 INPUT GAIN CONTROL

Input level gain control potentiometer, allowing to match the output voltage of the head-

unit’s RCA line-outs to the amp input of the active sub

10 POWER/PROTECTION LED

Green LED signalling correct operation of the amp module, red (“protection”) LED,

signaling general malfunction of the amp-module, i.e. overheating, shortcut a.s.o.

11 HIGH LEVEL ADAPTER

Plug to connect the loudspeaker outputs of a headunit to the amp module, if the headunit

has no dedicated RCA line-outs

7 8 9 bl

AB20A Manual D+E.indd 13 04.08.2006 15:57:33 Uhr