About this gear
A historically significant open-back headphone from 1961, the SP-3X represents an early milestone in stereo headphone design from Koss, the American pioneer credited with inventing the stereo headphone format. The open-back design prioritizes soundstage and natural acoustic presentation over isolation, making it a reference point for enthusiasts interested in headphone heritage and the evolution of personal audio.
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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