Pioneer VSX-21TXH User Guide

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• The listening modes and many features described in 

this section may not be available depending on the 
current source, settings and status of the receiver.

There are many ways to listen back to sources using this 
receiver, but for the simplest, most direct listening option 
is the Auto Surround feature. The receiver automatically 
detects what kind of source you’re playing and selects 
multichannel or stereo playback as necessary.

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AUTO SURROUND shows briefly in the display before 
showing the decoding or playback format. Check the 
digital format indicators in the front panel display to see 
how the source is being processed.

• If  the  source is Dolby Digital, DTS, or Dolby Surround 

encoded, the proper decoding format will 
automatically be selected and shows in the display.

• When listening to the FM radio, the Neural THX 

feature is selected automatically (see Using Neural 
THX on page 51 for more on this).

ALC – In the Auto level control (ALC) mode, this receiver 
equalizes playback sound levels.

• When an ALC is selected, the effect level can be 

adjusted using the EFFECT parameter in Setting the 
Audio options on page 66.

Using this receiver, you can listen to any source in 
surround sound. However, the options available will 
depend on your speaker setup and the type of source 
you’re listening to.

If you connected surround back speakers, see also Using 
surround back channel processing on page 59.

The following modes provide basic surround sound for 
stereo and multichannel sources.

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If necessary, press repeatedly to select a listening mode.

• If  the  source is Dolby Digital, DTS, or Dolby Surround 

encoded, the proper decoding format will 
automatically be selected and shows in the display. 

With two channel sources, you can select from:

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•

2 Pro Logic IIx MOVIE – Up to 7.1 channel sound, 
especially suited to movie sources

1 •  Stereo surround (matrix) formats are decoded accordingly using Neo:6 CINEMA or 2 Pro Logic IIx MOVIE (see Listening in surround 

sound above for more on these decoding formats).
• The Auto Surround feature is canceled if you connect headphones.

2 •  For more options using this button, see Using Stream Direct on page 59.

• The AUTO SURROUND mode cannot be selected in the following cases:
– When MULTI CH IN input is selected.
– When the HDMI audio output parameter is set to THROUGH in Setting the Audio options on page 66.

3 In modes that give 6.1 channel sound, the same signal is heard from both surround back speakers. 
4 The STANDARD listening mode cannot be selected in the following cases:

– When headphones are plugged in.
– When MULTI CH IN input is selected.
– When the HDMI audio output parameter is set to THROUGH in Setting the Audio options on page 66.

5 If  surround back channel processing (page 59) is switched OFF, or the surround back speakers are set to NO (this happens automatically if 

the Surround back speaker setting on page 91 is set to anything but Normal), 2 Pro Logic IIx becomes 2 Pro Logic II (5.1 channel sound).

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