May I have a little rant?
Remember when multiroom meant you could play whatever was on your main system, or possibly a second source, to remote speakers over wires?
As far as I can tell none of the speakers listed here can do this with my Onkyo TX-NR676! I purchased it recently to replace my trusty older Onkyo which met its demise after a lightning strike. Now I have a "network" receiver I'm looking forward to going mutiroom crazy to speakers all over the house. First up I tried Play-Fi and got the Phorus PR5 to hook up to my remote powered speakers. Got all the software setup, but no option to use the Onkyo as the source!
"Works with Sonos" it says, so maybe the Sonos Connect is the answer? Nope, you can't send audio from the Onkyo to the Sonos speakers, but you can make it the destination for whatever music is floating around your Sonos system.
Bluetooth? Er, no again. You can stream TO the Onkyo but not stream FROM the Onkyo, not even to bluetooth headphones!
See the pattern here? It seems the network works only one way - TO the receiver. So I have multiple redundant ways of streaming to the receiver, the aforementioned plus Chromecast, Airplay and probably a few others I forget, but not a single method to 'cast FROM the receiver!!!!!
Wait, I missed one thing - Flareconnect should be able to do what I want but only if I get new wireless speakers, which are few and far between from Onkyo or Pioneer. Certainly there seems to be no Flareconnect receiver I can use with my existing powered speakers.
I'm not trying to get all negative about the Onkyo, in may ways it is an excellent receiver which I'm enjoying. I'm not sure any other receivers can do what I want either, but I must say the networking capability falls well short of what it could be.
I have since found I can get some audio 2.4GHz transmitter/receiver pairs and connect to zone 2, but that additional hardware should be unnecessary on a "networked" receiver.
OK, thank you, rant over.