I tried a lot of closed headphones looking for a pair that I thought sounded good while delivering enough isolation to be used in noisy environments without disturbing anyone. I never got to Denon or AKG phones, but amongst closed Sennheiser, Beyerdynamic, Sony, and Audio-Technica phones that I've heard, the best by far are Darth Beyers. Somehow Darths don't suffer from the usual closed phone problems of creating excess pressure, clamping force, or bothersome sound characteristics. They make music sound a little bit "live", which I actually like, and otherwise don't mess with the music. All other closed phones I've heard sound wrong when compared to good open designs. Darths sound right to me. I would say it's not worth struggling through multiple pairs of cheaper closed phones to find a good pair. My recommendation would be that if you have the money, go straight for Darths. If you don't, then wait until you do.