Well i tried these out at best buy a couple of times. I was thinking of buying them as well when the sale was on.
Despite Sennheiser saying they are "bass enhanced" or something, its not bass heavy. Doesn't have a ton of bass but it is pretty warm headphone (rolled off treble). I quite liked the sound. The bass on these though wouldn't satisfy a basshead though. Even if you try to eq it, it'll probably start distorting before reaching basshead levels of bass.
Also theres no need for an amp. They ran fine out of my iphone & clip+.
Edited by audioKyle - 3/19/13 at 12:51am