You know, I've heard a lot of IEM's and a lot that sound like they've got bass, but few really really hit the low notes. The Nocs NS200, however, ain't one of those. They are like 80$ (expensive) but have big, nice bottom ends. I'm not sure if they are the bassiest i've heard as I don't remember everything, but they are very very bassy, certainly more so than any competing product I've heard in the price range. The MEEL wood iem, too is mass bassy and so too, is the Mingo WM2, but the Mingo and the MEEL tended to boom too much into the lower midrange for comfort.