Listening to your system
06
69
en
Phase Control ON
• Rhythms with crystal-like clarity
• Bass sound with no loss of depth
• Sound of musical instruments with superb reality
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.
SC-27:
SC-25:
1
Set the remote control to the receiver operation
mode.
2
Press PHASE CTRL (PHASE CONTROL) to select
PHASE CONTROL.
The
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
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 88.
Front speaker
Subwoofer
Sound
source
Original sound
preserved with no
loss of clarity
Listening
position
SOURCE
TV
RECEIVER
VOL
VOL
TV CONTROL
CH
RECEIVER
iPod CTRL
CATEGORY
HOME
MENU
STATUS
THX
PQLS
MPX
MEMORY
PHASE CTRL
CH LEVEL
TUNE
PRESET
PRESET
PGM
MENU
STEREO
AUTO/ALC/
DIRECT
STANDARD ADV SURR
RETURN
PHASE CTRL
PHASE CTRL
STATUS
REMOTE
SETUP
HDD
PGM
DVD
ANT
THX
AUDIO
MULTI OPE
INFO
DISP
MPX
PQLS
MEMORY
CH
RECEIVER
TV CTRL
RECEIVER
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 (Auto MCACC & Full Band Phase Control)
on page 46), 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 GUI screen (see
Using Full Band Phase Control
on page 69). 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
Output PC
on page 120).
SC-27_25.book Page 69 Monday, April 6, 2009 7:15 PM
