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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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beyerdynamic DT 990 PRO 250 ohm Studio Headphones (Ninja Black, Limited Edition) with 4-Channel Headphone Amplifier Bundle (2 Items) - Newegg.com
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