Pioneer VSX-820 User Manual

En

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.

You can listen to sources using the Acoustic 
Calibration Equalization set in Automatically 
setting up for surround sound (MCACC) on 
page 29. Refer to these pages for more on 
Acoustic Calibration Equalization. 

Acoustic Calibration EQ on or off.
The MCACC indicator on the front panel lights 
when Acoustic Calibration EQ is active.

2

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.

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.

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 headphones are connected.

2 You can’t use Acoustic Calibration EQ with Stream Direct mode and it has no effect with headphones.

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