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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 Ohm Open-Back Studio Mixing Headphones Bundle -Includes- Soft Case, Headphone Splitter, and More : Electronics
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