I've heard that the XB 1000 has a head-sucking sub bass. Could anyone compare the XB 500, 700, and 100 in terms of JUST THE SUB BASS?

My budget is around $500, amplifier and accessories included. I'd like for the headphones themselves to be around $300, but I'm willing to pay more if it's worth it. I'd like for it to be portable, so it's better to have little or no sound leak. As long as it's not super loud, I'm fine.

Hey guys, this is my first post and my first thread here. I'm going to go ahead and establish the fact that I'm a complete noob when it comes to headphones. All I care about is the lower bass in music. I don't care much about mid bass, and I honestly don't give a poop about mids and highs. All I...