Bose SOUNDTOUCH Start Here Manual page 3

Choose an audio cable
Option 1 (Preferred): HDMI™ ARC
If your TV has an HDMI™ ARC connector, connect the HDMI cable to your
TV's HDMI ARC connector and the soundbar's HDMI OUT TO TV (ARC)
connector.
OR
Option 2: Optical
If your TV doesn't have an HDMI ARC connector, connect the optical
cable to your TV's Optical OUT connector and the soundbar's
OPTICAL IN connector.
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