The PA2V2 is  a good amp, Nice Value ($56.00) on EBay (Bids) back in Sept. they are going for around $70.+ when I checked a week ago. For higher end headphones it probably will not suit Your needs, sometimes it pushes the high's a little to high for My preference, the midrange is pretty good and the bass is only as good as the song was recorded (Zune, IPod) just not enough drive for bass hungry headphones. I have a pr. of GRADO 225i's and when I use them with My portable cd player I hear the difference in the overall sound! The Power switch & Volume...