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Mcacc Auto Room Tuning - Pioneer VSX-1130-K Reference Manual

Pioneer vsx-1130-k; vsx-830-k; vsx-530-k av receivers.
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Audio Technologies

MCACC Auto Room Tuning

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.
Phase Control
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.
Advanced MCACC Auto Room Tuning
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/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
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 LFE 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.
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.
Speaker sizes and number of
speakers are automatically detected.
MCACC Reverberation Characteristics
Before Calibration
Time (msec)
The "Phase Control" Compensates for the Delay of Low-Frequency Sound
Effect of Auto Phase Control Plus (data comparison)
Original disc playback
Front L
Delay setting: 0 msec
Superior sound provided by compensating the lag in the subwoofer channel on the disc.
Standing Wave in a Typical Listening Room
After Calibration
Speaker distance, sound pressure level, and
frequency response are all equalized.
After Calibration
Time (msec)
AV Receiver
Playback with Auto Phase Control Plus
Front L
Delay setting: 9 msec
= Standing Waves


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