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I have my beam gen 2 connected to my Samsung TV TU 7000 via EArc. Audio on tv is set to pass through.

i am using the beam with 2x play ones

In the Sonos app it says the audio is Dolby Multichannel PCM 5.1

i have tried Prime Video and Netflix, still no ATMOS. I’m using a Firecube 4k Ultra . Any help greatly appreciated.

I used the test audio and video feature in the fire tv cube and it does support ATMOS, when I tested it ATMOS did show in the Sonos app. Clearly it is the sources that are not using ATMOS, e.g. Prime Video, Netflix.

I played the movie Dune and the Sonos app showed ATMOS, so problem solved.