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About this gear
An evolution of the Pro4AA design, the Pro4AAA continues Koss's Pro line legacy with refinements introduced in the mid-1970s. This closed-back over-ear model reflects the brand's iterative approach to professional headphone design during a pivotal era.
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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