@chungjh: USB to S/P-DIF or AES3 is a fairly well-trodden path; there are some suggestions in this thread for suitable devices although it might be a little out of date now. Many of us on the forum have used the Mutec MC-3+ USB which can convert USB audio to either/both of S/P-DIF and AES3 and is generally reckoned to be a "good thing" (although not cheap).
It might be worth bearing in mind that in the Expert series before Pro/CI, the AES3 input was generally thought to sound better than USB. There are reports in the forum that any difference in sound quality between these inputs has narrowed in the Expert Pro/CI. In the end it's an evaluation you will need to make for yourself.
PS as @David A mentioned this is a bit off-topic, so perhaps best to continue the discussion in either of the two threads I linked to above.
It might be worth bearing in mind that in the Expert series before Pro/CI, the AES3 input was generally thought to sound better than USB. There are reports in the forum that any difference in sound quality between these inputs has narrowed in the Expert Pro/CI. In the end it's an evaluation you will need to make for yourself.
PS as @David A mentioned this is a bit off-topic, so perhaps best to continue the discussion in either of the two threads I linked to above.
Roon (Mac Mini), Wilson Benesch Full Circle, Expert 1000 Pro CI, Kaiser Chiara
Warwickshire, UK
