[mvicp]

I had the chance to demo a bunch of headphones the other day and ultimately I liked the Sennheiser HD 600s more than the rest. The only things that keeps me from buying them is the bass performance. So, I wanted to know if there are some other headphones like the 600s, but perform better in the bass and sub-bass areas. I am still relatively new in the audiophile world and I'm still learning new things. I just recently learned what soundstage is haha. I did like the 650s a little too. The sound was very smooth, but at cost the treble. I didn't like that. Anyways, any help will be appreciated.
 
Edit: I also want to add that I listen to a wide range of music, so I am in need of something that is very versatile.

 

[mvicp]

Nothing?

 

[Billheiser]

HiFiMan HE400 maybe or Denon ah-d2000. I like them both, tho not quite as much as my hd600 overall. They both have more pronounced bass.

 

[KG Jag]

The HE-500--which are being closed out.  You will need an amp with decent power.  See:
 
http://www.head-fi.org/t/634201/battle-of-the-flagships-58-headphones-compared-update-audeze-lcd-2-revision-2-6-4-13#user_HE500
 
vs.
 
http://www.head-fi.org/t/634201/battle-of-the-flagships-58-headphones-compared-update-audeze-lcd-2-revision-2-6-4-13#user_HD600

 

[Rhamnetin]

The Philips Fidelio X2 seems to be exactly what you're after.  It's said to be like a lower impedance Sennheiser HD 600 but with more bass.