chainrock:
I can't help you with an alternative to an Airport Express, but there's an excellent shareware application - Airfoil (www.rogueamoeba.com/airfoil/) that allows you to send any audio to the AE. Cheers, Tony
Many thanks! Can you give me a rundown of how it works? This could be a savior!
EDIT: I didn't know iTunes playback is bitperfect over USB...
Re: airfoil - it captures audio from any application (either one you select or 'System Audio") and sends it to either Airport Express, the computer, or both. It was $25 when I bought it. Useful for things like BBC Radio which isn't iTunes friendly. Win or Mac.
As for bit-perfectness, yeah it is when working with 16/44 material, but don't know about higher as haven't tried it with 24/96 stuff yet - primarily because just when I had a window to have a go, my network picked that very moment to disappear. Internet research suggests yes, you are limited to 16/44, will confirm over next few days.