I use mine with a CEntrance DACmini. I believe it is along the same lines as the DACMagic. There are 2 models, one comes with a power amp for speakers, and the other just powers the headphones. I have the latter, as I have powered speakers for my desktop. To my ears, this amp is about as neutral as you can get. There is loads of power for the HD700, and I can damn near use the headphones as speakers when plugged into this thing. It is quite compact, looks good (I got mine in black), and very easy to use. CEntrance's USB implementation is one of the best on the market. I am quite happy with mine, and don't forsee myself looking to upgrade this any time soon.