The bass on these headphones is just jaw dropping. Everything sounds so separated even on this hip-hop track from Three 6 Mafia I am listening to in FLAC. The slam just sits right below the rest of the sound without breaking separation even with the deepest 808 lows. The bass isn't the kind that shakes the earpads, it's the super clean kind that you feel air moving from the ortho pushing with authority.
EDIT: This is coming from a guy who owns 2 12'' subwoofers. One for my car, one for my house :]