Apple TV isn't even necessary. That might be the easiest way since you seem to want to stick w/ the Apple ecosystem, and really are only looking for a way to connect/route the signal to a device. This would allow you to keep your current receiver if you like. Plug and play for the most part. Run a simple digital optical cable out from the airport express (small adapter piece required from Apple) to the receiver, and switch between speaker pairs as you see fit. Done .