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When in Settings > About My Sonos System > Playbar, Audio In changes between Dolby 2.0 and Dolby 5.1? Why is this? I have a Playbar, Sub and two 5's.
The audio format is going to change based on the source material that is sent to your playbar. If the program your watching was recorded in stereo, you won't get surround sound.
Excellent, switched tv over and now says 5.1, thank you.