What's wrong with UPnP?

[Bitperfect]

@danny

Unfortunately, both Airplay and Songcast have two fundamental problems related to sound quality. One is limited format support (no DSD) and that the clock is driven by the source, instead of the receiver (the endpoint surely will have the best crystal in the room).

I think you are wrong about how Airplay manages audio Clock. It isn’t source that drives the clock. Airplay doesn’t use s/pdif or similar protocol. It is a network based protocol and lays on top of TCP/IP.