Mdhoover,
Ok here is what I think is the easiest rout at this point. Y off of the back of your DAC. Take one set of cables to your PRE and take the second set to your head phone amp. Audioquest makes makes a nice set of Y adapters for about $25.00 US. I use one to take a center channel out to a stereo amp for bi-amping my center channel works just fine.
Warning I tried this with a DVD player and monster Y adapters to go to the stereo and to the TV and got distortion out of the stereo. I am pretty sure this was due to an impedence mismatch. So before spending big bucks on an extra set of cables give it a try. IMHO a $25.00 experiment is worth it.
Michael
