(explanation is only in german, but here is the description from spotify):
Multi Room.Spotify Connect is now available on a number of Multi Room systems, allowing you to group several speakers in your home to play the same music. And if you have several Spotify users in your family, you can stream music from different accounts in different rooms – so everyone can listen to their favourite music.
So i can group speakers and stream music to both, but how can i group the speakers?
Is it only available for speakers from the same company so for example only group speakers from philips or teufel to a group?
Has anybody out there a working multi room setup and can explain how the multi room option really works, because from the app itself Spotify is still not supporting Multi Room.
Just FYI, a big drawback (for me at least) with Chromecast Audio is that it doesn't support crossfade. I typically have 5-8s crossover and this doesn't work; plus an added gap if you're listening to 'mixed' albums. I've also had a few issues with dropped signal. Still, this may not affect you.
If you want decent standalone speakers to connect to, I'd recommend Edifier in general - solid build and very reasonable price for the sound quality, plus a range of different styles.