Phase-Shift Adjustment - EMPHASER EA24000D Einbau- Und Bedienungsanleitung

5.4 PHASE-SHIFT ADJUSTMENT

The phase shift function of the EA24000D can not be deactivated, as it is permanently in the signal
chain. The phase-shift control enables you to match the acoustical phase relations of subwoofer and
the speaker system playing in the front doors. The target is, that both speaker systems, normally sepa-
rated by aprox. 3m of distance shall play acoustically "in-phase" at the drivers seat location. A good
match of the acoustical phase between subwoofer and the system in the front doors will give you the
impression of bass sounds coming from a place in front of you. Or the other way round, the subwo-
ofer playing in the trunk of your car can not be localized that easily.
The second advantage is, that the upper bass region – i.e. where the sound waves radiated by the
subwoofer and the kickbass or front door mounted component system are crossing over - will sound
considerably more precise and tight. This phase adjustment can only be determined by ear, so you will
need somebody to help you to obtain best phase match. To judge the effect of the phase-shift adjust-
ment, you must sit on the drivers seat, and somebody must adjust the phase shift control knob until the
sound reproduction in the bass region is best. Furthermore, it might be necessary to invert the (con-
nection) polarity of your subwoofer – and re-adjust the phase, if you can not find a proper match with
the normal in-phase subwoofer connection.
CAUTION: If two or more EA24000D amps are used in a system it is of vital impor-
tance that the phase-shift control potentiometers are ALL set to identical positions!
Otherwise, cancellation of the reproduced bass signal will occur!
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