@ghdprentice Since you mentioned the HD800’s I’ll jump in and tell you about how I run mine.
I got a custom wired Cardas clear to a pair of XLR females so I can plug them directly into my Atma-sphere pre amp since Ralph stated it can drive headphones well. I’ve never had a dedicated headphone amp to compare, but I’m pretty happy with the results. I have done the felt/foam ring mod, and have removed the dust covers, all to good effect.