SC07-05.book Page 13 Friday, April 25, 2008 11:59 AM
Simple Home Theater Guide
Phase Control technology provides coherent sound
This receiver analyzes the frequency-phase
reproduction through the use of phase matching1 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.
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 playback2 – 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.
TV SOURCE RCV
Furthermore, the enhanced frequency-phase
characteristics between channels ensure better
surround sound integration for multichannel setting.3
STANDARD ADV SURR
Set the operation selector switch to RCV, then
press PHASE CTRL (PHASE CONTROL) to select PHASE
Full Band Phase Control OFF
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
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.
Group Delay Characteristics
Sound in the middle- and low-frequency ranges is
delayed against the high-frequency sound due to group
• 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
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.
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.
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).