[pxlpshr]

I may be misunderstanding your question but I'm a big fan of Denon (or Marantz) receivers w/ HEOS. Their AVR line can support up to 3 zones and can be paired together. I have 11.2 and 9.2 powering 18x speakers and a sub in my house. You can use a single receiver to play music outside by our pool and simultaneously play 5.1 over the living room for sports or movies. It also handles the connection to Spotify (et al) directly so I can take a call or leave the house with my phone and the music will continue to play.

[germinalphrase]

This is probably the option I would (like to) go for. I just want a stereo receiver that lets me control all the same “dumb” speakers I own in multiple rooms from my phone.