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How do you check the audio format that's being outputted by the Beam? I heard you can check it with the app, but I don't see where... I have a beam and two ones and I want to make sure I'm getting surround sound.
In About My Sonos System
For a bit more detail...

Android/iOS: More > Settings > About my Sonos system
Windows: Help menu > About my Sonos system
Mac: Sonos menu > About my Sonos system