Pioneer VSX-LX51 manual Better sound using Phase Control, Phase Control ON, Phase Control OFF

5 minute guide

•See also Listening to your system on page 29 for information on different ways of listening to sources.

It is possible to check on the display whether or not multi- channel playback is being performed properly.

When using a surround back speaker, 2D+PL IIx MOVIE is displayed when playing Dolby Digital signals, and DTS+Neo:6 is displayed when playing DTS 5.1- channel signals.

When not using a surround back speaker, DOLBY DIGITAL is displayed when playing Dolby Digital signals.

4Use the volume control to adjust the volume level. Turn down the volume of your TV so that all sound is coming from the speakers connected to this receiver.

Better sound using Phase Control

This receiver’s Phase Control feature uses phase correction measures to make sure your sound source arrives at the listening position in phase, preventing unwanted distortion and/or coloring of the sound (see illustration below).

During multichannel playback, LFE (Low-Frequency Effects) signals as well as low-frequency signals in each channel are assigned to the subwoofer or other the subwoofer and the most appropriate speaker. At least in theory, however, this type of processing involves a group delay that varies with frequency, resulting in phase distortion where the low-frequency sound is delayed or muffled by the conflict with other channels. With the Phase Control mode switched on, this receiver can reproduce powerful bass sound without deteriorating the quality of the original sound (see illustration below).

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Phase Control ON

	Front speaker	Listening
		position
Sound		Original sound
source	Subwoofer	preserved with no
		loss of clarity

•Rhythms with crystal-like clarity

•Bass sound with no loss of depth

•Sound of musical instruments with superb reality Phase Control technology provides coherent sound

reproduction through the use of phase matching1 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.

THX STATUS PHASE

DTV/TV	EON	MPX SIGNAL SEL
AUDIO	DISPLAY	CH
TV CTRL		RECEIVER

•Press RECEIVER, then press PHASE (PHASE CONTROL) to switch on phase correction.

The PHASE CONTROL indicator on the front panel lights.

Phase Control OFF

Front speaker

Sound source Subwoofer

Listening

position

Sound muffled due to a delay in time

•Rhythms blurred and difficult to hear

•Bass sound with loss of depth

•Sound of musical instruments with no reality

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 HDMI audio output parameter is set to THROUGH in Setting the Audio options on page 69.

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