How do I output sound from my multizone receiver to different rooms without speaker wire in the walls?
A multizone reciever with speaker wires in the walls to the different rooms is an alternative setup to the squeezebox system described here, but the two approaches are not mutually exclusive. You could run speaker wire from your multizone reciever to other zones, or you could send the sound over ethernet via some kind of conversion system. I believe there are a number of such setups, including one by Leviton. It is my understanding that these systems can equal the performance of audio wiring.