Pioneer VSX-21TXH User Guide

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• Default  setting:  OFF

When you’re not using surround back speakers, 
selecting this mode allows you to hear a virtual surround 
back channel through your surround speakers. You can 
choose to listen to sources with no surround back 
channel information, or if the material sounds better in 
the format (for example, 5.1) for which it was originally 
encoded, you can have the receiver only apply this effect 
to 6.1 encoded sources like Dolby Digital EX or DTS-ES.

1

back channel options.
Each press cycles through the options as follows:

• VirtualSB ON – Virtual Surround Back is always used 

(for example, on 5.1 encoded material)

• VirtualSB AUTO – Virtual Surround Back is 

automatically applied to 6.1 encoded sources (for 
example, Dolby Digital EX or DTS-ES)

• VirtualSB OFF – Virtual Surround Back mode is 

switched off

In a 7.1-channel surround system with surround 
speakers placed directly at the sides of the listening 
position, the surround sound of 5.1-channel sources is 
heard from the side. The Up Mix function mixes the 
sound of the surround speakers with the surround back 
speakers so that the surround sound is heard from 
diagonally to the rear as it should be.

2

• Using  the  Up Mix function is effective when the 

speakers in the 7.1-channel surround system are set 
up as recommended in the example on page 18.

• Depending on the positions of the speakers and the 

sound source, in some cases it may not be possible 
to achieve good results. In this case, set the setting to 
OFF.

 STANDBY/ON.

The display shows RESET 

 NO .

Use TUNE +/– (or 

/ on the remote control) to select 

 ON , and then use PRESET +/– (or / on 

the remote control) to select ON or OFF.

• When set to ON, the UP MIX indicator on the front 

panel lights.

1 • You can’t use the Virtual Surround Back mode when the headphones are connected to this receiver or when any of the stereo, Front Stage 

Surround Advance or Stream Direct mode is selected.
• You can only use the Virtual Surround Back mode if the surround speakers are on and the SB setting is set to NO or if Front Bi-Amp, Speaker B 
or ZONE 2 is selected at Surr Back System.
• The Virtual Surround Back mode cannot be applied to sources that do not have surround channel information.

2 • Set to ON regardless of this setting when playing DTS-HD signals.

• May automatically be set to OFF even when set to ON, depending on the input signal and listening mode.

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