TBH. no headphones have produced brainshaking bass response without amp (or EQing / bass boost) in my experience. :P Only audiophiles used to no bass boost may think otherwise perhaps. ^^
Now I'm obviously speaking at low / reasonable 24/7 listening volumes, of course you could crank the volume but by then the mids & highs will seriously damage your hearing too. Since I don't like listening overly loud I need quite a big bass boost to feel satisfied at the lower volumes.
yeah , but I mean there are a good number of headphones with moderate to loud listening levels that can do that. The lp/lp2, XB500, Beat Studios,and Beat Solos.