Pioneer SC-89/CUXJ Reference Manual page 6

Advanced Multi-Channel Stereophonic Philosophy
Advanced MCACC Auto Room Tuning
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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 system automatically measures crossover frequency
— much easier than the previous manual setting — and also lets
you check the measured data by MCACC application in the
AVNavigator. The subwoofer EQ feature has been newly added,
for auto or manual EQ adjustments.
Auto Phase Control Plus
During Blu-ray Disc/DVD/multi-channel file
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
Speaker Polarity Check
The Advanced MCACC will check the speaker polarity for
proper connection. "Reverse Phase" will be displayed on the
GUI screen if the speaker's wiring (+ and -) is inverted.
Standing Wave Control
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.
Subwoofer EQ
This new EQ feature allows you to adjust the subwoofer
tone. For Auto MCACC, the subwoofer EQ is automatically
adjusted with EQ type ALL CH ADJ, while manual adjustment
is available with EQ type SYMMETRY and FRONT ALIGN. As
with other EQ, the manual adjustment can be done on the AV
receiver's GUI.
ELITE AV RECEIVERS REFERENCE GUIDE
The "Phase Control" Compensates for the Delay of Low-Frequency Sound
Source
Effect of Auto Phase Control Plus (data comparison)
Original disc playback
Front L
LFE
Delay setting: 0 msec Time
Superior sound provided by compensating the lag in the subwoofer channel on the disc.
Standing Wave in a Typical Listening Room
6
AV Receiver
Speakers
PHASE CONTROL
Playback with Auto Phase Control Plus
Front L
LFE
Delay setting: 9 msec
= Standing Waves
Time