[cr0sh]

What about something like this?

http://strobe.audio/

I mean - that's just the first hit I found searching for open-source multi-room audio streaming for the raspberry pi. There were others.

Seriously - once you got one node to work, at that point clone the sd card (just dd it), and pop the image onto new cards for each new node. I don't know what kind of configuration or fiddling you might have to do, and while it isn't a "plug-n-play" thing like Sonos, you (and everyone else here) probably have the smarts to figure it out.

And once you have it figured out for one - the copying it and duping it to the other nodes and setting them up is probably not much of a stretch.

[nl]

It says on that site "the user interface is a work in progress".

There a lots of these projects. They all sorts, kinda work if you are prepared to do work and ignore the faults.

For one, it doesn't do HDMI CEC. For another, no form of surround sound. No Spotify support. Etc etc.

I just don't think that trade-off is worthwhile.

One you buy active speakers (which have to be wired to the raspberry pi, sigh..) it isn't even much cheaper.