How to use your old Play:5 (1st gen) or Play:3 speakers for movies in perfect sync
I've been trying to watch videos using my old Sonos speakers for years without success: I kept getting sound delays or had to go through unreliable, convoluted tweaks. Until I found out about this trick that allowed me to use room filling digital audio for movies, using my existing Sonos setup, in perfect sync.
It prevented me from having to invest in yet another expensive sound bar for movies, while perfectly fine Sonos setup was around in my living room. The solution does not involve the Play:5 line-in, which never was a real option, as it adds an audio delay that ruins image/audio sync.
Anyways, the solutions below is working well for me so far.
Limitations:
Digital stereo sound only, no surround or 5.1
Need to have at least 1 Sonos AirPlay speaker, if you don't have one already (min 99$).
Your Sonos AirPlay speaker may need to be muted each time you start a movie, if you don't use it for your home cinema.
What you'll need:
Apple TV (4th gen) or Apple TV 4K, with tvOS 13
