Samsung UN55D6000SFXZA - Manual (Page 81)

◀ ▶
English
● 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.
N Audio Format option may differ depending on the broadcast. 5.1ch Dolby
digital sound is only available when connecting an external speaker through
an optical cable. But it is also available through the ARC feature.