@yyzsantabarbara i know they will accept a direct fiber input from native Playback devices. They have their own sources. I will ask Andreas if it is possible for the DACs to receive a fiber signal from another source.
@thieliste preamp stage and volume control in both units are very good. I have found that it has worked well with both pairs of my monos (CANOR and Art Audio) along with the stereo amps (AGD, Rogue and Carver) I have lying around.
That said, I have never heard a DAC output stage that compares to my Art Audio or CANOR preamps. They just sound better. It will do the job without frustration, yes. Will it be the absolute be all, end all in terms of match, unlikely.

