Sony WEGA KV-30XBR910 Operating Instructions Manual page 82

Speaker
Audio Out
Easy control of
volume
adjustments
On Select to turn on the TV speakers.
Off Select to turn off the TV speakers and listen to
the TV's sound only through your external
audio system speakers.
This option can be set only when the Speaker option is set
to Off.
Variable The TV's speakers are turned off, but the
volume output from your audio system can
still be controlled by the TV's remote control.
Fixed
The TV's speakers are turned off and the
volume output of the TV is fixed. Use your
audio receiver's remote control to adjust the
volume through your audio system.
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