Pioneer VSX-LX70 manual 02 5 minute guide, Using Phase Control

025 minute guide

3 Press S.DIRECT (STREAM DIRECT) to select ‘AUTO SURROUND’ and start playback of the source.1

If you’re playing a Dolby Digital or DTS surround sound DVD disc, you should hear surround sound. If you are playing a stereo source, you will only hear sound from the front left/right speakers in the default listening mode.

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

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 and Full Band Phase Control

This receiver is equipped with the two types of functions that correct phase distortion and group delay: Phase Control and Full Band Phase Control. Activating Full Band Phase Control is strongly recommended because it also involves the effects of Phase Control. For details on each of these two features, refer to the following explanations.

Phase Cotrol OFF
	Front speaker	Listening
		position
Sound		Sound muffled due
	Subwoofer	to a delay in time
source

•Rhythms blurred and difficult to hear

•Bass sound with loss of depth

•Sound of musical instruments with no reality

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

•Rhythms with crystal-like clarity

•Bass sound with no loss of depth

Using Phase Control

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).

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

reproduction through the use of phase matching2 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.

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 PHASE CONTROL.

The PHASE CONTROL indicator on the front panel lights.

Note

1• You may need to check the digital audio output settings on your DVD player or digital satellite receiver. It should be set to output Dolby Digital, DTS and 88.2 kHz / 96 kHz PCM (2 channel) audio, and if there is an MPEG audio option, set this to convert the MPEG audio to PCM.

•Depending on your DVD player or source discs, you may only get digital 2 channel stereo and analog sound. In this case, the receiver must be set to a multichannel listening mode (see Listening in surround sound on page 29 if you need to do this) if you want multichannel surround sound.

2• 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 MULTI CH IN is selected.

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

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