I am not using the DDC currently. Both my current DACs, Mojo Audio Mystique X SE with Lundahl nano-crystalline chokes and AD-1862Z chips, and an Aries Cerat Helene, sound best through their USB input so that I what I am using.
The USB comes out of a Sonore Signature Rendu SE Deluxe optical that is connected to a SGC sonicTransporter i9 via A fiber optic cable.