I'm curious if anyone's done any objective testing on why high end headphones sound so different? Is it a mainly a correctable factor such as frequency response? Or is it something non-correctable such as stored energy, resonance, or non-linear distortion? It seems to me that most good...

I've been a satisfied owner of the Sennheiser hd-580's for several years, but recently decided to take a gamble and purchase a Stax basic system II. It wasn't that I was all that unhappy with the hd-580's, but the midrange veil and midbass hump that those cans are notorious for were bothersome...