Pioneer VSX-819H-S User Manual

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If the room environment is not optimal for the 
Auto MCACC Setup (too much background 
noise, echo off the walls, obstacles blocking 
the speakers from the microphone) the final 
settings may be incorrect. Check for household 
appliances (air conditioner, fridge, fan, etc.), 
that may be affecting the environment and 
switch them off if necessary. If there are any 
instructions showing in the front panel display, 
please follow them.

• Some older TVs may interfere with the 

operation of the microphone. If this seems 
to be happening, switch off the TV when 
doing the Auto MCACC Setup.

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.

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.

Sound 
source

Sound 
source

Listening 
position

Listening 
position

Front speaker

Subwoofer

Front speaker

Subwoofer

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