I own an m-audio Fast-Track USB Sound card which I use. I bought both these headphones & the sound card for work. My initial reaction to the headphones is they were cheaper than some of the others, but better sound and comfort than the other DJ style headphones. Plus they fit my budget, so I picked them up at the Guitar Center. So after using these guys at work for almost 2.5 years, after not listening to them for a month or so, what I noticed finally is that they have completed the burn-in process. The music, especially the mids/base finally feel...