Summary: For comparason's sake, I've got a Headroom amp I use to power Sony MDR V900's, Grado SR200's & my top dynamic choice: Sennheisser 580's. The sound source for all is a desktop Nakamichi CD system that I use on my nightable. The Koss 950 compares most closely with the Senn's sound. The Senn's have excellent transparency, but the Koss, with its corresponding driver, has even more. Details on the Koss are more precise-- truly impressive.