I think I am understanding what you are saying here but the setup I’m imagining allows me to take these portable Sonos in and out of backyard and just add when I want to. The yard is already done. I don’t have ability to run speaker wires nor can an amp be in outside area. So question is, does the amp (if installed inthe rack with all the rest of components) allow the wireless Sonos (like a Sonos move) connect to it and then in turn, connect to C4 rather than air playing the Sonos move speaker directly to Apple Music?