Play sonos s1 stream on s2 system

No. Speakers have to all be on the S1 app to play an S1 stream.

Ah ok. Is this not a bit odd considering the rationale for S2 was to allow compatability with more music services etc. than S1 hardware could support. Surely playing an S1 stream (albeit with no control over it other than volume) would be pretty basic / obvious here?

Hi. What is an S1 stream, please? 

By S1 stream I mean music currently playing on a Sonos S1 system zone or group. Apologies I should maybe have explained this more clearly. 

In order to group S1 and S2 rooms together to play the same stream, both the S1 and S2 units need to recognize/identify the other unit(s) in the group.  Since the S1 units are memory bound, there is no room in the S1 firmware to add the support for the new S2 units like the Arc or Roam.  Which is the reason for the S1/S2 split in the first place - S1 doesn’t have enough room to accommodate new devices and/or functionality.

Yes, I get that S1 doesn’t have the capacity to do this, however, surely an S2 system could detect that an S1 system is already playing on the same network and “lock on” and play this stream.

The S1 system would be effectively unaware of this, but the net effect would be that the two systems would operate as one. 

This is absolute gibberish.  Nonsense. Meaningless 

There is no such thing as an "S1 stream" . There is a music source playing on a group of speakers within a Sonos system.  To play on other Sonos speakers they have to be grouped.  That is how Sonos plays synched music. It is fundamental to the system design. 

So Sonos cannot play across two systems; not even two S2 systems. Certainly you cannot group speakers from S1 and S2 or that would completely negate the purpose of having S1 and S2.

Sonos does not work that way.  Put a different way, Sonos never designed the S2 system to allow users to select “S1 system playing on the same WiFi network” on the same network and play that instead TV, aux input, or a streaming service.  There are numerous issues with that.  For one, it would be difficult if not impossible to keep the music in sync, since the S1 system would not be aware that it’s to play in sync with another system.  Two, what if there are more than one stream playing in the S1 system?  How do you identify them and properly pick up which stream you wish to play?  Three, I’m not sure you can just easily hijack data being transported from one device to another, or a net as the case is with Sonos, particularly when it’s Sonosnet and not your actual Wifi.  Four, if you’re an Apple user, this would be much better accomplished by using Airplay, I believe. So, most of your customers are no longer using S1, many of those don’t also have an S2 system, and rougly half of the remaining already have a solution...and the number will always get smaller.  It’s hard to argue that such a feature would drive product sales, or worth charging a subscription fee over. Does it really seem like a wise development effort for Sonos to pursue?

Apologies, didn’t mean to cause any offence.