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I owned the original Koss Electrostatics and was not impressed. Their weakness seemed to be in the amplification unit which badly colored the sound. If I remember, they used a passive transformer for the signal boost. These didn't last long before I retired them for a conventional headphone design.
I later bought a pair of Stax electrostatics which made a world of difference (but at a much higher cost). I would hope that Koss learned their lesson after all these years. It's hard to tell these days with little performance specs and very few trusted reviews.
BTW, I'm a true believer in the ability of electrostatics to excel. I designed and built a pair of hybrid electrostatic/transmission-line woofer speakers and have been rocking them for years.