Most audiophiles, I think, have an awareness of the headphone manufacturer Stax. But for those who don’t have an intimate familiarity, Stax is best-known as the original producer of electrostatic headphones – that is, headphones that use an extremely thin, electrically-charged membrane suspended between two “stators,” a grid of conductors that carry a high-voltage charge that moves the membrane. Electrostatic headphones have a reputation for being extremely detailed and extremely fast, possibly moreso than any other kind of headphone. Even today, electrostats enjoy the benefit of greater speed and lower distortion than all but the most premium dynamic and planar-magnetic headphones.
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https://majorhifi.com/stax-sr-009s-review-the-air-elemental/