excellent. Thanks for the info. If there is a way to control the ringing, these would definitely move up a large notch in capability.
The resonance with the earcups and the odd soundstage are two of the biggest drawbacks of these headphones... what they do well, they do well at a near flagship level (speed, timbre, imaging). What they don't do well, ends up holding them back pretty heavily (flat and wide soundstage - not holographic at all, ringing/ear cup resonance, cable, earpads, FR, difficulty to drive, poor bass quality). Obviously the cable, earpads, FR, and difficulty to drive have easy fixes for them (some can be done for free and most are gonna cost you), but getting rid of the earcup resonance would be a huuuuuuuuuuge improvement. The soundstage is something I am willing to deal with and for $599 right now at Adorama, these are probably some of the finest headphones you can get.
For reference, the drawbacks are being compared to headphones far higher in price than the he6se, so take that with a grain of salt. These headphones are pretty solid, but I think they have a decent amount of room for improvement with some simple fixes that will take them to the next level.