I've decided I want to get a beyerdynamics set of headphones for active listening at home, and casual listening at work. I'm trying to decide between the 770 (closed), 880 (semi-open), and 990 (open) models, and also whether I should get the 250 ohm or the 32 ohm version.
I will be wearing them at work, so I worry that the 990's would disturb my officemate, who is seated 10 feet away from me. How much sound really escapes at a regular (not loud) listening level? What about the 880's?
From my research, it appears that the 880's have the most level response, while the 770's and 990's are heavier on bass and treble. Why would you want headphones that are heavier at _any_ frequency? Wouldn't you want the most accurate representation of the original recording? My understanding is that if Bach or Fergie wanted the bass louder in their song, they would have made it louder. Can somebody help me understand this point?
Last of all, with respect to sound quality and fidelity, is 250 ohms significantly "better" than 32 ohms? If I go the 250 ohm route, I would be happy to use an amp, but I can't find significant evidence that 250 ohms produces superior sound.