I was gifted a Roam and I wanted to add it to my Sonos system. It is incompatible with S1 - and most of my speakers are the same. In the process of trying to split the system, I disconnected a Play:5 from my system. I tried to reconnect it using the various instructions online. No joy! The reason is that when I go to my S1 Controller on my iPhone and +Add Product, it simply refers me to an Update requirement for my system - to S2. I simply cannot add a product to my existing S1 system.