Amazon.com: beyerdynamic DT-990 Pro Acoustically Open Headphones (250 Ohms) with Knox Gear Hard Shell Headphone Case and Wooden Headphone Stand Bundle (3 Items) : Electronics
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Amazon.com: beyerdynamic DT-990 Pro Acoustically Open Headphones (250 Ohms) Bundle with Compact 4-Channel Stereo Headphone Amplifier with DC 12V Power Adapter (2 Items) : Electronics
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