The bass is very 'robust' but doesn't seem to overpower as much as what many refer to as basshead headphones. I like a slightly raised bass myself since you don't 'feel' the bass like you do with speakers and slightly raising it kind of helps give the impression of a nice balance imo.
The CAL2 sounds like big speakers to me. (As in floorstanders) It really has a very solid sound and is what Sennheiser refer to as 'bass led' sound. So if you like a pure, flatter sound, this may not be for you.
I have a preference for headphones that try to emulate speakers in tonality so for me, the Senn hd600, 650 and the modded Fostex T40/t50 really suit my tastes. I don't have much of a problem with the sound of the CAL2 because it is a warm sound but also quite rich in detail.
It's a little thicker sounding than my T50 with a passive filter switched on to raise the treble dip, but without the filter switched in, the CAL2 has a similar timbre to the T50 with velour pads. Perhaps the T50 is a tad darker without its filter switched in, but the CAL2 has more bass thwack. it also goes really low down too, like the T50.
Edited by iancraig10 - 12/18/13 at 11:34am