Pioneer VSX-420-S - Manual (Page 29)

Listening to your system 04
29
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Using Phase Control
This receiver’s Phase Control feature uses
phase correction measures to make sure your
sound source arrives at the listening position in
phase, preventing unwanted distortion and/or
coloring of the sound (see illustration below).
During multichannel playback, LFE (Low-
Frequency Effects) signals as well as low-
frequency signals in each channel are
assigned to the subwoofer or other the
subwoofer and the most appropriate speaker.
At least in theory, however, this type of
processing involves a group delay that varies
with frequency, resulting in phase distortion
where the low-frequency sound is delayed or
muffled by the conflict with other channels.
With the Phase Control mode switched on, this
receiver can reproduce powerful bass sound
without deteriorating the quality of the original
sound (see illustration below).
Phase Control technology provides coherent
sound reproduction through the use of phase
matching
1 for an optimal sound image at your
listening position. The default setting is on
and we recommend leaving Phase Control
switched on for all sound sources.
• Press PHASE to switch on phase
correction.
Note
1 Phase matching is a very important factor in achieving proper sound reproduction. If two waveforms are ‘in phase’, they crest
and trough together, resulting in increased amplitude, clarity and presence of the sound signal. If a crest of a wave meets a
trough (as shown in the upper section of the diagram above) then the sound will be ‘out of phase’ and an unreliable sound
image will be produced.
• If your subwoofer has a phase control switch, set it to the plus (+) sign (or 0°). However, the effect you can actually feel when
PHASE CONTROL is set to ON on this receiver depends on the type of your subwoofer. Set your subwoofer to maximize the
effect. It is also recommended you try changing the orientation or the place of your subwoofer.
• Set the built-in lowpass filter switch of your subwoofer to OFF. If this cannot be done on your subwoofer, set the cutoff
frequency to a higher value.
• If the speaker distance is not properly set, you may not have a maximized
PHASE CONTROL effect.
• The PHASE CONTROL mode cannot be set to ON in the following cases:
– When the PURE DIRECT mode is switched on.
– When the MULTI IN input is selected.
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Sound
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Sound
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Listening
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Listening
position
Front speaker
Subwoofer
Front speaker
Subwoofer
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PORTABLE TUNER SIGNAL SEL
MIDNIGHT PHASE S.RETRIEVER VOL
VSX-420_SY_En.book 29 ページ ２０１０年３月１９日 金曜日 午前９時３７分