I was doing some research and noticed that Speech Enhancement and Night Mode are not available over Airplay 2. This is the only way I can send audio from my Apple TV, since it's attached to the projector on the ceiling.
My question is, why can't these features function over Airplay 2?
To my understanding, Airplay 2 broadcasts 5.1 audio (Dolby Atmos) in lossless format. So, in theory, it shouldn't be problem.
Best answer by Airgetlam
First, for better or worse, Sonos considers AirPlay 2 to be an audio signal, not a video signal, so none of the video enhancements are available on that signal.
Second, I believe AirPlay 2 only sends a stereo signal to devices that are not Apple TVs.
Third, I’ve never seen the ability to separate video and audio so that they’re sent to two different devices via AirPlay 2.
If this is indeed the road you intend on traveling, I would be considering sending the AirPlay 2 signal only to the Apple TV device, and then separate the audio from the HDMI stream before it reaches the projector.