The video Chromecast do multiroom audio, so if you have a soundbar with HDMI input that might work, or a surround receiver.
Home Automation
Home automation is the residential extension of building automation.
It is automation of the home, housework or household activity.
Home automation may include centralized control of lighting, HVAC (heating, ventilation and air conditioning), appliances, security locks of gates and doors and other systems, to provide improved convenience, comfort, energy efficiency and security.
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I'm building out a system to sync music between my multiple bookshelf systems using snapcast on rPi /hi berry DAC running Mopidy music players. Should be able to plug into any device depending on the DAC you choose. Control from my phone. Choose which snapcast /combo of snapcast clients to sync to. All without having to run multichannel audio to every room
You can get used audio Chromecasts. They were cool. Leave it to Google to drop a nice product because they can't get rich off of it, even though it was part of their ecosystem. Anyway, I have them throughout the house. Easy to sync and control. Other companies outside of Google provide cast features.
Have you looked at Arylic audio? They have a few units that allow WiFi control and multiroom audio. I've got an A30+ and it's good. I can even control it from my Fibaro system.
Checkout Andover audio, their streamers have worked really well for me. Touch pricy but solid and sound good. I bought two and hooked them up to my wired system as input 1 and 2 that way me and my wife have a player each.