the bass goes very low - in tests, only a few dbl lower than 0 when going to 20Hz, but the mids are more forward, so they are less audible. trust me though, the bass does go very low and with little fall off. treble is detailed enough, but rolls off by quite a few dbl. the problem is that too many iems are fatiguing because the treble still goes very far whilst being so close to the poor eardrum.
i love the jh13pro for that reason. it is not treble energetic. sometimes, however, i wish for more emphasis.