The posts above extolling the Sennheiser's 600 family bass are below the belt!
I lived with a pair of HD-600 phones for two years. The bass was what finally drove me to find an alternative (happily the AKG 501). To my ears the Senns are casebook studies in tilting a frequency response to produce an unbalanced, bloated and compressed sound.
More specifically, the 600s sound like bass with a colagen injection -- no life, all bloat, no tune. It's bass that puts the music on the sacrificial alter. The headphones are the antithisis of music. They are fatiguing. They are squeezed. They are headphones for people who want to hear that one really big note in a way that makes damned sure it doesn't get missed. I think we used to have a term for it back in the heyday of poorly designed 15 inch monitors -- BOOM.
What a day when I finally got a hold of the Akg-501. Suddenly the music was back, and real -- you know, integrated, fingers-plucking-strings, and kick drums-powered-by-real-feet, and synth lines that cornered like Ferarris and not Lincoln town cars with too many golf bags in their respective trunks.
But hey, if you want to lay back in the LazyBoy and gaze at your signicant other with that loopy "hi-fi" look on your face and wait for that 30 mhz tone so you can interrupt the concert with "Mable, you gotta hear this low bass," go for it...I mean by all means. All I can say is that the 600 family just about euthenised this pair of ears.
Thank God I got out of the LazyBoy. Thank you AKG-501 for restoring the music! Thank you, thank you, thank you...AND AT WHAT A BARGAIN PRICE!!!