After reading the entire thread over the past few days, I though I'd revive it. New HE-500 owner. Had them for less than 3 days and am in the process of breaking them in with the Bifrost/Lyr combo. Came from the HE400, HD650 and now have the Senn HD700. I kept my Q cable which I had with the HE-400 and it's lovely on the HE-500. Immediate difference with the Q (definitely smoother and eliminated a lot of the grain) over the stock silver which will probably never see the light of day again. Lessons learned from the HE400, I got the fit right by bending the headband and went straight to the velour pads.
With only 30 hours of burn in, I'm really liking them and do hear the changes as they mature. I really hope the soundstage opens up which is probably my biggest complaint so far. Soundstage on the HD700 is pretty amazing. Love the fullness, the pure lush and smoothness of the HE-500. Can't wait to get another 100 hours or so on them.
Edited by MickeyVee - 2/25/13 at 3:58pm