Headphones Kramer

Koss Pro4AA portable stereophone is full-size professional quality stereophone and has long been the headphone of choice for broadcast and recording professionals whose careers demand reliable equipment and superior performance. As the first dynamic stereophone to deliver true full frequency, high-fidelity performance, the PRO4AA set the standard when it was introduced in its original form in 1970. In the late 1980s after long service, it was retired and replaced by a newer model. Customers clamored for its return and by 1988 it was brought back by popular demand. Since then, though performance-enhancing technology has been incorporated and updated, the essence of the PRO4AA remains