Sony KE-37XS910, KE-42XS910 Operating Instructions Manual page 89

Option Description
Speaker On
Off
Audio Out
This option can be set only when the
Off.
Easy control of
volume
Variable
adjustments
Fixed
Select to turn on the TV speakers.
Select to turn off the TV speakers and listen to the
TV's sound only through your external audio
system speakers.
Speaker
The TV's speakers are turned off, but the audio
output from your audio system can still be
controlled by the TV's remote control.
The TV's speakers are turned off and the audio
output of the TV is fixed. Use your audio
receiver's remote control to adjust the volume
(and other audio settings) through your audio
system.
option is set to
87