The Sonos Beam has eArc and most new TVs only have one "eArc" connection.
If I now want to connect an AppleTV 4K box.... which device should be connected to eArc? The Sonos Beam or the Apple TV? For example, I want to play Dolby Atmos with the Apple Music app on the Apple TV.

Question

The Sonos Beam has eArc and most new TVs only have one "eArc" connection. 
If I now want to connect an AppleTV 4K box.... which device should be connected to eArc? The Sonos Beam or the Apple TV? For example, I want to play Dolby Atmos with the Apple Music app on the Apple TV.

Answer

I would use the eArc for your Apple Box and use an optical cable to connect from the TV to the Beam.

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Question about Sonos Beam Gen 2

The Sonos Beam has eArc and most new TVs only have one "eArc" connection. If I now want to connect an AppleTV 4K box.... which device should be connected to eArc? The Sonos Beam or the Apple TV? For example, I want to play Dolby Atmos with the Apple Music app on the Apple TV.