many think it may not ever happen at all, though some partnerships are beginning to emerge. One day we may see cross platform speaker grouping happen, where everything is playable on 'everything' in perfect sync, but I’m not going to hold my breath whilst waiting for this to happen. I guess the closest step towards a multi-speaker cross-platform music system is Apple's new AirPlay 2 protocol, but even then, it still has a long way to go to get things in sync, plus the audio plays through the controller device rather than direct from the audio source to 3rd party speakers.

I can’t see this changing too much in the neat future. Presently the Amazon and Sonos speakers operate entirely separate from each other, in the same way that Sonos and Bose and other speakers do not work together through their Apps. Sonos has its own Multi-Room grouping system in the Sonos App, which is faster/easier to group/ungroup speakers 'on the fly' and supports stereo paired speakers and those in a bonded home theatre setup. Not really the Amazon Alexa 'Multi-Room Music Groups' is currently just for Amazon echo devices only, which are all standalone and cannot be stereo paired etc. The fact this has not been added in almost a year is very disappointing Then I tried to group the speakers and it didn’t know the command. I purchased the beam and just enabled Alexa and the first thing I tried after haveing it play so Music is to also play the current song on another speaker and no go. Wow I can not believe this is not a feature yet.

Alexa multi room music