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http://downloadcenter.samsung.com/content/UM/201301/201301311...

Audio Return Channel
Lets you direct the sound from the TV to the home theater speakers.
Requires an HDMI connection and an Audio Return Channel (ARC) compatible TV.

• When Audio Return Channel is set to Auto, the home theater automatically selects either ARC or optical input as the audio source, depending on your connections. If Audio Return Channel is active, optical input does not work.

Speaker Selection
Lets you select which speakers you want active, either the TV's speakers or the home theater's speakers.