The bass stays basically the exact same as with pleathers. Don't know with the mods and J$ though. People shouldn't expect basshead cans with the HE-400. They are however quite impactful and natural sounding bass. If you want emphasized bass, best go with the millions of dynamic headphones that do just that.
That being said, the HE-400 with some bass boosting is pretty hard to beat... there's a lot of potential there if you wanna go that route. The HE-400 with the E17 on +4 bass was incredibly awesome.
I don't think I even came close to implying that I was a basshead, expected the HE-400 to be basshead cans, or that I wanted the bass to be the emphasis. I love the HE-400, my favorite headphones by far, was just wondering about that specific instance. So thank you for your insights on that instance, of course.
I'll try the bass boost on my E17 or maybe try some EQing for the first time ever with the M&M. That will be interesting, not sure where to start though.