Simple Home Theater Guide
02
13
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.
•
Set the operation selector switch to RCV, then
press PHASE CTRL (PHASE CONTROL) to select PHASE
CONTROL.
The
PHASE CONTROL
indicator on the front panel lights.
Using Full Band Phase Control
The Full Band Phase Control feature calibrates the
frequency-phase characteristics of the speakers
connected.
Standard speakers designed exclusively for audio use
generally reproduce sound with the divided frequency
bands output from a speaker system consisting of
multiple speakers (in case of typical 3-way speakers, for
instance, the tweeter, the squawker (midrange), and the
woofer output sound in the high-, middle-, and low-
frequency ranges, respectively). Though these speakers
are designed to flatten the frequency-amplitude
characteristics across wide ranges, there are cases
where the group delay characteristics are not effectively
flattened. This phase distortion of the speakers
subsequently causes group delay (the delay of low-
frequency sound against high-frequency sound) during
audio signal playback.
This receiver analyzes the frequency-phase
characteristics of the speakers by calibrating test signals
output from the speakers with the supplied microphone,
therefore flattening the analyzed frequency-phase
characteristics during audio signal playback
2
– the same
correction is made for a pair of left and right speakers.
This correction minimizes group delay between the
ranges of a speaker and improves the frequency-phase
characteristics across all ranges.
Furthermore, the enhanced frequency-phase
characteristics between channels ensure better
surround sound integration for multichannel setting.
3
Full Band Phase Control OFF
Sound in the middle- and low-frequency ranges is
delayed against the high-frequency sound due to group
delay.
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.
• 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 96.
SOURCE
TV
RCV
VOL
VOL
CH
SOURCE
TV
RCV
iPod CTRL
CATEGORY
HOME
MENU
STATUS
THX
MPX
MEMORY
PHASE CTRL
CH LEVEL
TUNE
PGM
STEREO/
A.L.C.
BD MENU
AUTO/
DIRECT
STANDARD ADV SURR
RETURN
PHASE CTRL
2 To calibrate and analyze the frequency-phase characteristics of the speakers, either follow the
Full Auto MCACC
procedure under
Advanced
MCACC
(see
Automatically setting up for surround sound (MCACC & Full Band Phase Control)
on page 10), or set
Auto MCACC
menu under
Auto MCACC
under
Advanced MCACC
to
FULL BAND PHASE CTRL
. Select
ALL
when you perform the
Auto MCACC
with
Auto MCACC
menu. Upon calibration of the frequency-phase characteristics of the speakers, the
FULL BAND PHASE CTRL
feature is automatically
switched on. Note that
FULLBAND PHASE
cannot be selected unless the frequency-phase characteristics of the speakers are calibrated.
3 The original characteristics of group delay of the speakers calibrated and the targeted characteristics after correction can be displayed
graphically in the OSD (see
Using Full Band Phase Control
on page 13). Also, when your PC is connected to this receiver, the original
characteristics of group delay of the speakers calibrated and the corrected characteristics of group delay can be displayed in 3-dimension on
your PC (see
Advanced MCACC output using your PC
on page 72).
Tweeter
Midrange
Woofer
Group Delay Characteristics
ms
Hz
SC07-05.book Page 13 Friday, April 25, 2008 11:59 AM
