Samsung UN65D8000XFXZA - Manual (Page 68)

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English
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■ Speaker Settings
● Speaker Select (External Speaker / TV Speaker)
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’s speakers and the speakers attached to your
audio receiver. If this occurs, set the TV to
External Speaker .