Adjustment Of Phase Shift Control - RoDEK R2100A Installationshandbuch

R4100A_Manual 2002- 25.02.2002
4. CROSSOVER SETTINGS
Turn-on your head-unit and set the volume control to ap-
proximately 3/4 of full volume, while playing a dynamic
track from a CD. Slowly increase the LEVEL adjustment
control of the channel pair section to which your sub-
woofer 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
remaining channel pairs, by turning up the correspon-
ding level controls - aiming for a balanced sound with a
slight emphasis in the bass range. All remaining chan-
nels, no matter if this concerns rear mounted coaxials,
component- 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 ad-
justment 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 pha-
se-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-
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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 jud-
ge 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 necessary
to invert the (connection) polarity of your subwoofer -
and re-adjust the phase, if you can not find a proper
match with the correct polarity in-phase subwoofer
connection.