Who is using their DAC as a preamp?

I may just take a week and exclusively use my Pro-Ject Dac as a pre and see what I think after a week. 

i use my RME ADI-2 Pro as a preamp

I am very interested in the use of the Project Prebox S2 as a pre. Please do share your findings. I believe you use it with a Nuforce STA200, correct? 

yes. I used it a couple years ago for about 2 or 3 weeks and was amazed how much better it sounded vs my Nova preamp. I'm getting ready to switch now and I will share my findings. I'm interested to see if I will "miss" my Rogue RP-5 preamp.

Another post about passive. Just try it, and, for a while. Believe me when I say, I had 2 preamps above an RP5 in sq, that colored the sound, held back details and information on my recordings, and unnaturally added balls and oomph to the music. Listen to SRVs " Tin Pan Alley ", a song many believe has been over played, but shows every attribute, and weakness, in a system.