I have an existing system with an ARC, Sub 3, and two SL One as surround sound used as theater listening and linked to a TV all of which are in my family room. These are on my sonos app showing under family room.
I just got a ERA-300 which I intend to put in my office in home room. This will be the first item in this new office in home room.
In adding this new speaker to the SONOS app, there appear to be two options, Get started with setup which is “white box” or “Join existing sytem “a non white box” to click on. Which one do I check?