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About this gear
The flagship ESP-9 represents the pinnacle of Koss's 1970s electrostatic research, engineered for discerning listeners seeking the transparency and detail retrieval that only full-range electrostatic drivers can provide. Its higher price reflects both the sophistication of electrostatic technology and Koss's positioning of the ESP-9 as a reference-class instrument.
About Koss
American headphone pioneer founded in 1958 by John C. Koss in Milwaukee — credited with inventing the first stereo headphone (the SP/3). Koss's Porta Pro, introduced in 1984, remains in production and is one of the most beloved headphones ever made, offering remarkable sound quality and musicality a...
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