Transit does not upsample to 48 kHz. I can program Transit to do 44.1 or 24/96 and it passes iTunes, MP3 and AC3. It uses a custom driver that bypasses Windows Kmixer.
Transit is probably not the best solution for iMac. I have heard that the drivers are not realy optimized for iMac. A modified Edirol with coax S/PDIF out is probably the ticket. It uses standard drivers - you dont need to install any.
The Airport express would probably make a good adapter if the wireless network solution was buffered well and isochronous. I'm not convinced based on what I have read.
Transit is probably not the best solution for iMac. I have heard that the drivers are not realy optimized for iMac. A modified Edirol with coax S/PDIF out is probably the ticket. It uses standard drivers - you dont need to install any.
The Airport express would probably make a good adapter if the wireless network solution was buffered well and isochronous. I'm not convinced based on what I have read.