Who is using their DAC as a preamp?

My Adcom GDA 700, feeds my Luminous Audio Axiom II, with Walker Mod, 3 in, 2 out ( single ended ), with remote, feeds any number of power amps. I replaced a few excellent preamps with this, soon after I purchased a very high gain power amp ( Nuforce STA 200 ). I am currently using an ADA PF 2501 amp in this configuration, and I never heard this amp before ( meaning, it never sounded this good ). No preamp for me.

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.