I would stay away from this. This was my first headphone amp, and I made the big mistake choosing this over a few others because it was cheaper at the time, and it looked good. This thing hums with any headphone you throw at it(both low and high impedance), didn't sound much better than my portable, had to turn it almost all the way up just to drive some 300ohm cans, and it died on me after a year. I remember reading that others who tried this a few years ago having some of the same issues. These amps have been around for a while, and there's a reason you don't hear much about theme around headfi. On top of all of that, it's much more expensive than it was a few years ago. I think I got mine for a little over 200.00 shipped, and believe me, that was way too much.