Samsung UN40D6500 E-Manual page 46

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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.
Audio Format
N
Dolby digital sound is only available when connecting an external speaker
through an optical cable.
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option may differ depending on the broadcast. 5.1channel
English
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