I would say the LCD-X is somewhere in between the LCD-2 (a good one though, there might be variations) and HE-6 in terms of timbre. With the HE-6 a tad brighter. Not as smooth as either. Similar and fairly good bass response on all these three cans though.
The Mad Dogs that I've heard seemed to have more bass punch than the LCD-2s.
Edited by ultrabike - 11/10/13 at 4:20pm