Pioneer VSX-921-K Operating Instructions Manual Download Page 34

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Listening to your system

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

, then press PHASE to switch the P.CTL

(Phase Control) ON or OFF.

Note

• 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.

• 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 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

in the

following cases:
-

When the

PURE DIRECT

mode is switched on.

When the headphones are connected.

Using surround back channel processing

You can have the receiver automatically use 6.1 or 7.1
decoding for 6.1 encoded sources (for example, Dolby Digital
EX or DTS-ES), or you can choose to always use 6.1 or 7.1
decoding (for example, with 5.1 encoded material). With 5.1
encoded sources, a surround back channel will be
generated, but the material may sound better in the 5.1
format for which it was originally encoded (in which case, you
can simply switch surround back channel processing off).

• With a 7.1-channel surround system, audio signals that

have undergone matrix decoding processing through
surround back channel processing to which the Up Mix
function is added are output from the surround back
speakers.



Press

, then press SB CH repeatedly to cycle

the surround back channel options.

Each press cycles through the options as follows:

•

SB ON

– Matrix decoding processing for generating the

surround back component from the surround component
is turned on.

•

SB AUTO

– Matrix decoding processing for generating

the surround back component from the surround
component is switched automatically. Matrix decoding
processing is only performed when surround back
channel signals are detected in the input signals.

•

SB OFF

– Matrix decoding processing for generating the

surround back component from the surround component
is turned off.

Setting the Up Mix function

In a 7.1-channel surround system with surround speakers
placed directly at the sides of the listening position, the
surround sound of 5.1-channel sources is heard from the
side. The Up Mix function mixes the sound of the surround
speakers with the surround back speakers so that the
surround sound is heard from diagonally to the rear as it
should be.

• Using the Up Mix function is effective when the speakers

in the 7.1-channel surround system are set up as
recommended in the example on page 10.

• Depending on the positions of the speakers and the

sound source, in some cases it may not be possible to
achieve good results. In this case, set the setting to

OFF

Switch the receiver into standby.

While holding down PRESET



on the front panel, and

hold the



STANDBY/ON for about two seconds.