Pioneer VSX-LX70 manual Using Full Band Phase Control, Press Phase Phase Control to select

5 minute guide 02

Using Full Band Phase Control

The Full Band Phase Control feature calibrates the frequency-phase characteristics of the speakers connected.

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.

This receiver analyzes the frequency-phase 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 playback1 – 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.

Furthermore, the enhanced frequency-phase characteristics between channels ensure better

surround sound integration for multichannel setting.2

Full Band Phase Control OFF

Tweeter

Midrange

Woofer

Group Delay Characteristics

ms

Hz

Sound in the middle- and low-frequency ranges is delayed against the high-frequency sound due to group delay.

Full Band Phase Control ON

Tweeter

Midrange

Woofer

Group Delay Characteristics

ms

Hz

With the phase distortion corrected, the frequency-phase characteristics are improved across all ranges.

•Sound with live dynamics

•Sound of musical instruments with superb reality

•Sound so accurately reproduced that you can even hear the lip movement of the singer

•Speech heard with no loss of clarity

•Surround sound with excellent integration

PHOTO		T.DISP	STEREO/
STATUS	SIGNAL SEL SBch		F.S.SURR
MULTI OPE	THX	STANDARD	ADV. SURR

SHIFT PHASE MCACC S.DIRECT

•Press PHASE (PHASE CONTROL) to select

FULLBAND PHASE.3

Both the Phase Control and Full Band Phase Control functions are switched on. The FULL BAND PHASE CTRL indicator lights on the front panel display.

Note

1To calibrate and analyze the frequency-phase characteristics of the speakers, follow the procedures in Auto MCACC (see Automatically setting up for surround sound (MCACC & Full Band Phase Control) on page 8) or FULL BAND PHASE CTRL in the System Setup (see Full Band Phase Control on page 45). Select ALL when you perform the Auto MCACC setup with CUSTOM. 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.

2The original characteristics of group delay of the speakers calibrated and the targeted characteristics after correction can be displayed graphically in the OSD (see Full Band Phase Control on page 45). 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 61).

3• The FULL BAND PHASE CTRL mode cannot be set to ON in the following cases:

–When headphones are plugged in.

–When the PURE DIRECT mode is switched on.

–When MULTI CH IN is selected.

–When the HDMI audio output parameter is set to THROUGH in Setting the Audio options.

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