The treble is the captain of the ship, and will be either be loved and adored for many years to come, or loathed and reviled as one of the most treble/upper midrange heavy headphones you may hear (aside from Grados). The high frequencies are crisp and the open back creates an open and airy experience. It really is a nice experience, especially if you want to take a detour away from pure reference or bassy sounding headphones. If you are a lover of treble, purchase the HE350 because it will reward with oodles of treble, and probably then some.