Adjustment Of Phase Shift Control - RoDEK R2100A2 Installationsanleitung

4. CROSSOVER SETTINGS
Turn-on your head-unit and set the volume control to
approximately 3/4 of full volume, while playing a dynamic
track from a CD. Slowly increase the LEVEL adjustment
control of the channel pair, to which your subwoofer
system is connected to. Turn up the (sub channel) level
control knob until you can just about hear distorted bass
sounds. Now you reduce the volume level of your head
unit to a "normal" listening level and "add" all the re-
maining channel pairs, by turning up the corresponding
level controls - aiming for a balanced sound with a slight
emphasis in the bass range. All remaining channels, no
matter if this concerns rear mounted coaxials, compo-
nent- or kickbass systems installed in the front doors
- must be balanced against the main level setting of your
subwoofer. Usually, it's best to start with the adjustment
of the front door mounted speaker system level.
4.3 ADJUSTMENT OF PHASE SHIFT
CONTROL
The phase shift function of your RODEK amplifier can
be activated with the corresponding slide switch. The
phase-shift control enables you to match the acoustical
phase relations of subwoofer and the speaker system
playing in the front doors, either a component or a kick-
bass system. The idea is that both speaker systems, nor-
mally separated by aprox. 3m of distance are intended to
play acoustically "in-phase" at the drivers seat location.
A good match of the acoustical phase between subwoo-
fer and the system in the front doors will give you the im-
pression 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, there is no rule of thumb to find a good match,
and you will definitely need somebody to help you. To
judge the effect of the phase-shift adjustment, you must
sit in 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 neces-
sary to invert the (connection) polarity of your subwoofer
- and re-adjust the phase, if you can not find a proper
match with the correct in-phase polarity subwoofer con-
nection.
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