airport express with i-tunes

I think you can send digital signal from itune to Airport express. And Airport express have a little optial output go to your DAC. However, the cable that Airport can use (mini toslink to toslink) is not so good. Sound is lest than what I hope for. I use it throught a tri-vista as a ext. dac. I hope this help

Mschamberlin, Tri-vista is a SACD player with build in DAC. You can also make it work like a DAC, sending digital PCM to it and let it do the convertion. I am using wireless (wifi) on the airport and I think hardwire (using CAT5E network cable) might be better. I felt the wireless might increase the jitter on the signal and also the monster cable that I got is not so good. However, I can not find and good toslink cable with have one side using mini jack. If you connect them hardwire, it might have a better result.