My J3 does okay with them, but my quads were re-shelled and I'm not sure how that affected the sound (I bought them from another head-fier). I'm not a bass head, so they sound a bit bloated with some electric music (as in amped instruments) unless I tinker with the eq. I think they sound much better with acoustic music, but they aren't significantly better sounding to me than my GR07s. Custom cables are on the way, so maybe they'll sound better (I'm still not sure if it's all a placebo effect) soon.
Make sure you have MP Enhance off for this application, also drop your BBE to 4-6. Leave the entire EQ system at 0 across the board as well as Mach3Bass. (off)
Change the bass frequency band to narrow and drop it to 80Hz.