open protocol sonos is coming along. Got some new edifier mr3 speakers.
Apparently musicassistant bridges airplay and sendspin… so in theory i should be able to airplay synced audio to all the speakers in my house at once 🤔
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I found 
which should simplify the DIY side of things to avoid soldering stuff
Apollo Automation
CAST-1 Audio Casting
The Apollo CAST-1 makes your non-smart speakers smart! The CAST-1 plugs into powered speakers, amplifiers, and AV receivers with a 3.5mm cable and ...
Ooooh nice. I like that. Currently I have to tap some bluetooth stuff to get our main speaker set to play my audio.
Sonos is supposed to be plug and play but I have SO many problems with it. I hope you are successful