Samsung PN51E490B4FXZA E-Manual page 41

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Speaker Settings
® Speaker Select (lllExtema_ Speaker /_ 8peake8
if you are listening to the sound track of a broadcast or movie through an
external receiver, you may hear a sound echo caused by the difference in
decoding speed between the TV% speakers and the speakers attached to
your audio receiver, If this occurs, set the TV to IIExte a_ Speaker,
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When you set Speaker Select to IIExtema_Speaker, the TV's speakers
are turned off, You wiii hear sound through the external speakers only,
When you set Speaker Select to _ Speaker, both the TV's speakers
and the external speakers are on, You wiii hear sound through both,
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When Speaker Select is set to IIExte a_ Speaker, the VOLUME and
MUTE buttons wiii not operate and the sound settings wiii be limited,
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If there is no video signal, both the TV's speakers and the external
speakers wiii be mute,