Amazon.com: AKG K240 Studio Semi-Open Over-Ear Professional Studio Headphones with Knox Gear Headphone Amplifier : Electronics
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AKG K240 Studio Semi-open Pro Studio Headphones Bundle | eBay
Used AKG Acoustics K240 Studio Over-Ear Semi-Open Professional Headphones, 15-25000 Hz Frequency Bandwidth, 55 Ohms Impedance, 1/4" and 1/8" Screw-on Jack Combo 2058X00130