Reference Guide

Introduction MCACC MCACC ProThe Essence of MCACC Advanced MCACC Feature Comparison Technical Details
MCACC Reference Guide
Crossover Frequency Adjustment
Using the measured result, one suitable parameter is set for all
the speakers. This helps to prevent cancelling out of the bass
sound caused by a phase shift. Other manufacturers use
separate filters for each channel. This is fine when all the
speakers are of the same type, but with various types of
speakers, the timing of the bass will be inconsistent, causing
cancelling out with a loss of the bass sound.
Equalizer (Frequency Characteristic Adjustment)
The frequency characteristic for each channel is adjusted using
the 9-band EQ, which has minimal effect on the phase
characteristic while achieving optimum performance. As shown
on right, the general peak/dip correction method is good at
matching the frequency characteristics, but making detailed
adjustments on every peak and dip for each speaker will cause
phase shifts and deteriorate sound localization. In contrast,
Pioneer’s MCACC performs a frequency characteristic
adjustment using the Envelope Compensation technology with
low Q filter. This minimizes the effect on the phase, providing a
natural and smooth adjustment in a multi-channel playback
environment.
Pioneer
Front
Timing of LFE assigned to
SW from each main speaker
Other Brand
Center
Surround
Mix Result
Mix Result
Front
Center
Surround
Less power
Powerful bass
SW output
SW output
Interference
No interference
Comparison of Subwoofer Output
Pioneer’s Envelope Compensation vs. Peak/Dip Correction
Level/frequency characteristic before correction
Pioneer’s Envelope Compensation General Peak/Dip Correction
Level/frequency characteristic after correction
Phase/frequency characteristic after correction
Features
Less distortion in phase/frequency
characteristic, resulting in reduced timing
mismatch for multi-channel playback.
The level/frequency characteristic is matched,
but the phase/frequency characteristic is
largely distorted. This phase shift means
timing mismatch, with greater influence for
multi-channel playback using more speakers.
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