That's right. Very few pure CD transports output in USB. The Esoteric certainly doesn't. It is generally some form of SPDIF (optical or digital coax) and with the DAVE, it has already been well established that optical is superior to digital coax and even AES/EBU. Optical has the advantage of complete ground noise isolation and so passage of RF noise from the source is not an issue here. Historically, the issue with optical is jitter but as we know, the DAVE is completely immune to source jitter to a level of 2us. Then, there is the issue of mechanical noise but probably not an issue for most modern transports. Late last year, my Chord dealer and I did a blind test between 2 CD transports he had on hand that we connected via optical to the DAVE. We used a 1 minute segment from Mahler's 9th symphony as a test track. One was a $500 Cambridge Audio unit and the other was a $19,000 Wadia. While there were very subtle differences between the two, they were not enough to make a difference in terms of which transport we would choose even if both units cost the same. We would have been happy with either.