Samsung UN46ES6100GXZE - Manual (Page 108)

When the Speaker Select is set to TV
Speaker , both the TV’s speakers and
the external speakers are on. You
will hear sound through both.
N When the Speaker Select is set to
External Speaker , the volume buttons
and mute functions will not operate
and the sound settings will be
limited.
N If there is no video signal, both
the TV’s speakers and the external