Compared to the m50's how much different is the bass in HD555's?

I heard the Sennheiser HD555's have less bass than most headphones, is that true or is it just more controlled?

Okay so I just registered on this website and am looking for a nice set of headphones. Headphones I have tried before are the panasonic htx7's and jvc air cushions. I am willing to spend 100 bucks for new headphones but can go a little higher if needed. I mainly listen to trance, rap, and...