Samsung PN51D490A1DXZA - Manual (Page 70)

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English
■ Broadcast Audio Options
● Audio Language
(digital channels only)
Change the default value for audio languages.
N The available language may differ depending on the broadcast.
● Audio Format
(digital channels only)
When sound is emitted from both the main speaker and the audio receiver,
a sound echo may occur due to the decoding speed difference between the
main speaker and the audio receiver. In this case, use the
TV Speaker function.