Samsung PN51E6500EFXZA - Manual (Page 103)

Audio Delay function, a slider screen
appears. Adjust the option value using
your remote (0ms ~ 250ms).
Speaker Settings
Menu
→
Sound
→
Speaker Settings
●
Speaker Select
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