About this gear
The Pro4AA is a classic closed-back over-ear headphone from Koss's early Pro line, representing the company's push into professional-grade listening during the 1970s. Its vintage design and heritage make it a notable artifact in Koss's long catalog of headphone innovation.
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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