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5.6 PHASE-SHIFT ADJUSTMENT
The phase shift function of the EA1450XT/EA460-300XT can not be deactivated, as it is per-
manently 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 separated by approx. 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 subwoofer 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 adjustment, 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 (connection) polarity of your subwoofer – and re-adjust the phase, if you
can not find a proper match with the normal in-phase subwoofer connection.
