I have a bunch of Sonos speakers and hooked them all up to a Mac running Airfoil (https://rogueamoeba.com/airfoil/mac/). It isn't perfect and audio occasionally de-syncs or a speaker drops out. On a dedicated wireless channel playing a local source I imagine it would be pretty solid. Not really an option if you don't have a Mac to run Airfoil, though if you do you can use the Satellite... - Source: Hacker News / about 1 month ago

Within the house, I use Airfoil to stream between my computers and my systems. https://rogueamoeba.com/airfoil/mac/. Source: 12 months ago

You can use Airfoil to directly stream your song through your iPhone without having to bounce the song first. Source: about 1 year ago

You can also use an app like Airfoil from Rogue Amoeba for more control and output to Bluetooth and AirPlay devices as well as physically connected ones. Source: about 1 year ago

Have an explore of this software. Might be what you are looking for. Airfoil. Source: over 1 year ago

I recently started watching a lot of different TV series with a friend. We'd meet on Discord, decide on a new series or pick up where we left off yesterday, and just go "3, 2, 1, go!" and both click play. If we watched on Netflix, we could use a browser extension (netflixparty.com) that does the same thing as websites like w2g.tv or andchill.tv, but most of the time, we'd watch on... Other websites, which is why... Source: about 3 years ago

But it may be simpler to use a site like https://w2g.tv/ or https://andchill.tv/ or something with a YouTube or Vimeo source. Source: about 3 years ago