Pioneer VSX-21TXH User Guide

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• Rhythms  blurred and difficult to hear

• Bass sound with loss of depth

• Sound of musical instruments with no reality

• Rhythms  with  crystal-like clarity

• Bass sound with no loss of depth

• Sound of musical instruments with superb reality

Phase Control technology provides coherent sound 
reproduction through the use of phase matching

1

 for an 

optimal sound image. The default setting is on and we 
recommend leaving Phase Control switched on for all 
sound sources.

CONTROL) to switch on phase correction.
The PHASE CONTROL indicator on the front panel lights.

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, then the sound will 
be ‘out of phase’ and an unreliable sound image will be produced.
• The PHASE CONTROL feature is available even when the headphones are plugged in.
• 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 CH IN input is selected.
– When the HDMI audio output parameter is set to THROUGH in Setting the Audio options on page 66.

Front speaker

Subwoofer

Sound 
source

Sound muffled due 
to a delay in time

Listening 
position

Front speaker

Subwoofer

Sound 
source

Original sound 
preserved with no 
loss of clarity

Listening 
position

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