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Koss Pro4S review: Lightweight studio monitor headphones for engineers, producers and attentive audiophiles - CNET
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Koss KTXPRO1 Koss KTXPRO1 Portable Stereophone - Stereo - Mini-phone - Wired - 60 Ohm - 15 Hz 25 kHz - Over-the-head - Binaural - Supra-aural - 4 ft Cable - Walmart.com
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