I have seen several users complaining about the sound comming from their USB'ports and have experienced similar issues myself. The "only" solution seems to be to play music from an ancient CD drive (I have not used those in about 15 years). With my SE 846 and Mojo I hear some slight hiss comming...

I have been thinking long about what headphones / IEM's to buy and have landed on the shure se846. Since I listen to many bass heavy genres, Metall, dubstep, hip-hop and rap these seem like the ideal new IEM's for me. Now at the moment I have no DAC's nor AMP's sitting at my desktop and running...