Dubstep Girl, the D7000's do sub-bass like no other headphone I've heard. That sub-woofer style of bass is a trademark of their sound signature and the closed design helps in that respect. The HE-500's bass is more textured, with good detail. It punches hard and hits low but doesn't roll like the D7000's and never feels loose or wooly. Its bass you can really follow and groove to.
If I may use an analogy, the D7000's are like a 12 inch ported sub-box, the HE-500's are a sealed, 10" box with a pair of 8's along side it.
If there are tracks you'd like me to listen to, let me know and I'll give them a spin.
edit: I do want to mention that if I want a more wooly, looser and boomy type bass on the HE-500's, I'll listen to them on the ROC SA which adds that bottom end bloom, while the Auditor controls the bass with scalpel like precision and tightness (my preferred method). Its still no D7000's, but does go to show that HE-500's sound sig can be manipulated via the amp.