no useful augmented bass [from the bass exciter element] below about 40 cycles, hence it is a boomy mid-bass type of sound that is maybe a useful thing for most newer pops/techno/rap/hip-hop and the like, but much less so for jazz, classical and other musical genres. I would have liked them to give the bass exciter element more to do in the bottom octave where the real action begins. the headphones put out decently extended bass by themselves even without the batteries, though you can always hear the bass exciter element's resonance at roughly 60 cycles, as it provides a slight overhang onto any bass note in the vicinity. to make them musical [IOW to open up their sound] to my ear required much EQ, a boost in the treble starting at about 2k cycles on up, and a cut in the low mids, otherwise they sounded veiled.
