I've moved into a house that has 3 sets of wired in speakers - in a formal lounge, main lounge and a dining room. These all feed back to a central space where I've hooked in my old yamaha amp using a speaker for the main lounge and parallel connections for the formal and dining rooms.
The speakers are pretty inbuilt and pretty unlikely to be removed. ie half built into the roof/wall See this thread where I replaced the drivers in the dining room: http://www.geekzone.co.nz/forums.asp?forumid=34&topicid=174920&page_no=1#1322433
So it's mainly for FM, and I do have a raspberry pi with volumio for spotify/streaming/mp3 playback.
Ideally I'd like a feed in to master bedroom and later outside speakers from that dining room.
The concept of the sonos appeals. But I'd imagine some fairly hefty DIY to rip out the drivers and build a custom mount for a play:3 or play:5 into the inbuilt speaker frame. And add power from somwhere? (An extention dc run with cat 5e to replace the speaker wire?
Or I could get one of those sonos connect amps and a speaker switch for the 3 downstairs rooms, and put the bedroom one as a play3 by itself. Would mean that the 3 downstairs would always be the same source - which doesn't bother me too much, they're all next to each other - and in the main lounge you can turn them off.
Any other solutions? I guess I could ignore the inbuilt speakers, or do as someone suggested use 3 connect:amps - but that's way too spendy.