Weird, I tried EQing the bass up (mostly the 50hz bass but I think I tried the other bass levels too) on my 650s in foobar and it completely overcame everything else and nothing but bass could be heard. The whole spectrum above like 70hz was GONE I mean GONE. Also, if I listened for a minute the distortion was so bad that I was afraid they would blow so I flatted everything back after a couple of seconds at most. Scary experience. I guess you got lucky in having 650s that EQ well with bass but mine sure don't. The EQ was almost maxed from what I remember but from what I remember there was like no difference without that or something like that, whatever the reason mine still don't EQ well with bass.
If you ever consider getting XB500s or XB700s for bass fun, and you have HD650s, my recommendation is: DON'T. I tried XB700s a while back, and compared versus bass-boosted HD650s. The boosted HD650s were superior to the XB700s in every way, and could produce such powerful slamming / thumping / rumbling bass, it made the XB700s sound bass-weak in comparison. And of course, even with massive equalization, the HD650s were still a league beyond the XB700 in detail, clarity, and soundstage overall throughout the rest of the sound spectrum.
> Like if I'm watching Saving Private Ryan or Band of Brothers and a grenade or a bomb gets dropped, I love to be rocked just like it should be
This is exactly my experience with the HD650s. I was watching a HD action movie a while back, and I was continually impressed throughout the movie how realistic and perfect the explosions sounded.