Connecting Sonos Arc to Apple TV and other Sonos Speakers
Can other Sonos speakers connect to the Arc and play what is coming off the TV? So could listen in several rooms?
If you have the Apple TV box (4th generation or later), then you can play music (audio-only sources) to multiple AirPlay 2 speakers in your home.
This does not apply to videos.
AirPlay system requirements - Apple Support