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Phase Control
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When amplifying multi-channel audio signals,
receivers use a Low Pass Filter (LPF) to process
low-frequency signals for subwoofer output. This
causes "phase lag" — a delay of approximately
5 msec — of the low-frequency signals compared to the main
channel signals. As a result, the delayed bass makes the sound
lack synchronization. Pioneer's Phase Control technology
effectively eliminates phase lag and significantly improves the
multi-channel sound without any extra operation.
Auto Phase Control Plus
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During Blu-ray Disc/CD playback, Auto Phase
Control Plus makes real-time analysis of the phase
difference between the LFE (low frequency effect)
and the main signals, and automatically
compensates the gap. Elimination of phase lag
enhances strong bass and clear high-frequency
sound — especially effective for audio content such as live
performance and music video clips.
* Effectiveness depends on content
MCACC Auto Room Tuning
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Create the optimum acoustic environment with
Pioneer's MCACC (Multi-Channel Acoustic
Calibration System), developed with the
expertise of professional recording studios. The
system — complete with custom microphone — automatically
compensates for differences in speaker size, level and distance,
and equalizes response.
Advanced MCACC
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The Advanced MCACC uses a 3D calibration
method with even more precise measurements
by including the time axis. The AV receivers
also feature a speaker polarity check for
detecting misconnected cables, and a reverb measurement
display for showing before/after calibration results. The
measured data can be saved on your PC via the
AVNavigator. The system automatically measures crossover
frequency — much easier than the previous manual setting.
Standing Wave Control
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Acoustic standing waves occur when the sound waves from
your speaker resonate with those reflected off the walls.
Depending on the speaker placement, your listening position or
the shape of the room, standing waves have a negative effect
on the overall sound, especially in certain lower frequencies.
Standing Wave Control effectively decreases resonance and
prevents inaccurate EQ-setting calibration.
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The "Phase Control" Compensates for the Delay of Low-Frequency Sound
Source
Effect of Phase Control Plus (data comparison)
Original disc playback
Delay setting: 0 msec
Superior sound provided by compensating the lag in the subwoofer channel on the disc.
Acoustic Calibration by MCACC
Before Calibration
Speaker distance, sound pressure level, and
frequency response are all uneven.
The sound field is automatically
measured using the supplied mic.
SET-UP
MIC
Calibration
Speaker sizes and number of
speakers are automatically detected.
MCACC Reverberation Characteristics
Before Calibration
Reverb
Time (msec)
Standing Wave in a Typical Listening Room
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AV RECEIVERS REFERENCE GUIDE
AV Receiver
Speakers
PHASE CONTROL
Playback with Phase Control Plus
Delay setting: 9 msec
After Calibration
Speaker distance, sound pressure level, and
frequency response are all equalized.
SET-UP
After Calibration
Reverb
Time (msec)
= Standing Waves
MIC