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02
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Other problems when using the Auto
MCACC Setup
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.
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 (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 RECEIVER, then 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.
?
Sound
source
Sound
source
Listening
position
Listening
position
Front speaker
Subwoofer
Front speaker
Subwoofer
P
H
A
S
E
C
O
N
T
R
O
L
O
F
F
P
H
A
S
E
C
O
N
T
R
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L
O
N
BD
TV
INPUT SELECT
SOURCE
DVR
INPUT
TV CONTROL
RECEIVER
ZONE 2
ON/OFF
D.ACCESS
DIMMER
1
4
7
SB CH
S.RETRIEVER
HDD
+
10
SPEAKERS
2
5
8
PHASE
EQ
DISPLAY
SLEEP
MIDNIGHT
DVD
3
6
9
0
ENTER
CH
CH
CH SELECT
VCR
SHIFT
RECEIVER
RECEIVER
VSX-819H_KU.book Page 11 Thursday, December 25, 2008 8:36 AM
