Using full band phase control, Simple home theater guide 02, Full band phase control off – Pioneer SC-LX81 User Manual

Page 12

Simple Home Theater Guide

Phase Control technology provides coherent sound

reproduction through the use of phase matching

for an

optimal sound image at your listening position. The
default setting is on and we recommend leaving Phase
Control switched on for all sound sources.

•

Set the operation selector switch to RCV, then

press PHASE CTRL (PHASE CONTROL) to select PHASE
CONTROL.
The

PHASE CONTROL indicator on the front panel lights.

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 playback

– 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.

Full Band Phase Control OFF

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

Note

1 • Phase matching is a very important factor in achieving proper sound reproduction. If two waveforms are ‘in phase’, they crest and trough

together, resulting in increased amplitude, clarity and presence of the sound signal. If a crest of a wave meets a trough (as shown in the upper
section of the diagram above), then the sound will be ‘out of phase’ and an unreliable sound image will be produced.
• The

PHASE CONTROL feature is available even when the headphones are plugged in.

• If your subwoofer has a phase control switch, set it to the plus (+) sign (or 0°). However, the effect you can actually feel when

PHASE

CONTROL is set to ON on this receiver depends on the type of your subwoofer. Set your subwoofer to maximize the effect. It is also
recommended you try changing the orientation or the place of your subwoofer.
• Set the built-in lowpass filter switch of your subwoofer to off. If this cannot be done on your subwoofer, set the cutoff frequency to a higher
value.
• If the speaker distance is not properly set, you may not have a maximized

PHASE CONTROL effect.

• The

PHASE CONTROL mode cannot be set to ON in the following cases:

– When the

PURE DIRECT mode is switched on.

– When the

MULTI CH IN input is selected.

– When the HDMI audio output parameter is set to

THROUGH in Setting the Audio options on page 94.

SOURCE

RCV

VOL

SOURCE

RCV

iPod CTRL

HOME

MENU

STATUS

THX

MPX

PHASE CTRL

CH LEVEL

PGM

STEREO/

A.L.C.

BD MENU

AUTO/

DIRECT

STANDARD ADV SURR

RETURN

PTY

SEARCH

EON

TUNE

PHASE CTRL

2 To calibrate and analyze the frequency-phase characteristics of the speakers, either follow the

Full Auto MCACC procedure under Advanced

MCACC (see Automatically setting up for surround sound (MCACC & Full Band Phase Control) on page 9), or set Auto MCACC menu under
Auto MCACC under Advanced MCACC to FULL BAND PHASE CTRL. Select ALL when you perform the Auto MCACC with Auto MCACC
menu. 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.

3 The original characteristics of group delay of the speakers calibrated and the targeted characteristics after correction can be displayed

graphically in the OSD (see

Using Full Band Phase Control above). 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 70).

Tweeter

Midrange

Woofer

Group Delay Characteristics

SCLX81_71.book Page 12 Monday, June 2, 2008 6:16 PM

This manual is related to the following products:

SC-LX71