Saffy, I looked at the Sonos website and it says their players do provide a digital output and that they can handle all manner of files. Perhaps you have an older model?
My opinion is that a USB DAC is the way to go. One of the weak links in digital playback has been the jitter introduced by the spdif interface and cables. USB supposedly takes care of this or at least greatly reduces it. The problem for now is that it can't go wireless. The USB device server I talked about has zero advantages because as I stated in the previous post it isn't compatible with USB DACs. Silex was telling me they hope to have a wireless server that can handle USB DACs very soon.
My opinion is that a USB DAC is the way to go. One of the weak links in digital playback has been the jitter introduced by the spdif interface and cables. USB supposedly takes care of this or at least greatly reduces it. The problem for now is that it can't go wireless. The USB device server I talked about has zero advantages because as I stated in the previous post it isn't compatible with USB DACs. Silex was telling me they hope to have a wireless server that can handle USB DACs very soon.