Does it stand to reason that Sonos should be able to release a HomeKit Hub device (akin to Wemo or Hue) that would be able to interpret Siri commands on your phone as well as interface with HomeKit, and then relay that out to the appropriate legacy speakers (Play:1, Play:3, Playbar/Sub)?
Are there rumors of one? Doesn’t this seem like a logical solution for people who are happy with their Play:1s and Playbar, and don’t want to repurchase new gear?
Best answer by Ken_Griffiths
My suggestion .. buy one 'Sonos One' and put it out the way in a hallway etc. Switch off the mic, if that bothers you. Goto it’s Room Settings and set the volume limiter to its lowest setting ..and then play Airplay Audio to that device using Siri instructions.
If you need the audio on any of your legacy speakers, you will need to manually Group the Sonos One with those.
If you were not so bothered about having Alexa devices about the home and their mics turned on, then there are several methods to group the Sonos One with any of your others legacy Sonos speakers using Alexa voice commands, this can be easily done with a Harmony Hub, for example or (possibly) the yonomi alexa skill and I suspect in the not too distant future you will also be able to do this too with the new Alexa Grouping features.
But at the moment, manual grouping with a compatible Sonos AirPlay device is the only route I can see you being able to follow at the moment, particularly with the restrictions you have imposed on your current setup.
I can’t see any of the older Sonos legacy devices being able to control and play an AirPlay-2 source, which users may want to sync across multiple speakers and align with onscreen video sources etc; as Sonos have already stated their processors and memory capabilities are not upto the spec. required for such tasks.
You are probably going to need to buy some new hardware, at some point, to get these streaming features.