About this gear
The Pro4AAAT is a vintage closed-back over-ear headphone from 1980, representing Koss's engineering during the analog-era golden age of headphone development. Built for durability and straightforward sound reproduction, it reflects the industrial design philosophy of professional audio equipment from that period. A collectible piece of American headphone history from a founding innovator in the industry.
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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