Having both with me rn, I'd say more than a dt770, at least for my fan's noise.
Measurements would agree,
https://www.innerfidelity.com/images/MrSpeakersAeonsnACXB168.pdf
https://www.innerfidelity.com/images/BeyerdynamicDT770.pdf
whoa cool, do you have any more information?
(ex. is it still in early stages of development or close to being done? how does it look like / does it keep the
teardrop shape but just that a grill replaces the carbon fiber section?)
Did you just visit their factory to try them? I'd love to go hear them myself.