What I found experimenting with the Devialet over the weekend was that it really shines and goes to a whole new level with the better digital source and cabling you gave it. My favorite out of the Lumin digital bnc (requiring a bnc to coax adapter), Auralic Aries (tried usb, aes/EBU and coax), MacBook Pro (usb) and T+A PDP3000HV (coax) was the T+A PDP3000HV. The differences between digital sources, cables, etc. was dramatic.
The muckety mucks over on the Devialet Chat forum (who know this product inside and out) tend to love the TotalDAC Server via AES/EBU. Would love to try that.