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Passive Noise Reduction Full Size Headphones
The Koss QZ99 Passive Noise Reduction headphones were initially designed for racing radio scanner and metal detector users, with its superior isolating capabilities and secure over-the-head headband design. It has since become a favorite for audiophiles who crave the ability to cut out high levels of ambient noise. The QZ99's are not only for noise isolation, but also for sound quality.