I am currently looking for a multiroom speaker system which does not force me to place wiretap into my home. Also it should be able to simultaneously play the same song on multiple speakers. Which device can you recommend me?
Best would be if no additional internet connection is necessary.
Sonos is probably the easiest one as others have mentioned. A bunch of raspberry pi’s with pulseaudio configured for remote streaming from a master audio source could also work for playing the same song in multiple locations if you want a more diy approach
I'd imagine the pulseaudio approach would suffer from lag and inability to sync between devices. That's something that seemingly only Google and Sonos have solved (collaboratively at that - part of the source of the drama between the two in court).
Lag wasn’t terrible when I did it with one speaker, I’ll freely admit I have not tried it as a whole house setup but I’ve seen guides out there from people who have