Those look interesting, however they are about $150 more than I paid for the HD 650's that are currently my favorite pair from among the headphones I've tested so far. Also, I prefer cloth ear pads over leather, so there'd be the additional expense of replacing the ear pads. It would be nice to give them a listen though. Maybe if a modded used pair ever shows up here I'll give them a try. Quote: Yeah that was more or less my experience with a brand new pair of the Premium 600 ohms model, except perhaps not as severe as you're describing. However, from reviews I've read, the main difference between the 250 and 600 ohm models are the 600 ohm have slightly more refined treble.