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Amazon.com: beyerdynamic DT-990 Pro Acoustically Open Headphones (250 Ohms) and Knox Gear Compact 4-Channel Stereo Headphone Amplifier Bundle (2 Items) : Electronics
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Amazon.com: beyerdynamic DT-990-Pro-250 Professional Acoustically Open Headphones 250 Ohms (459038) with Full Size Headphone Case, Headphone Stand & Microfiber Cleaning Cloth : Electronics
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