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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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Amazon.com: beyerdynamic DT 990 Premium Edition 250 Ohm Over-Ear-Stereo Headphones. Open design, wired, high-end, for the stereo system : Electronics
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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 250 ohm Studio Headphones (Ninja Black, Limited Edition) with 4-Channel Headphone Amplifier Bundle (2 Items) : Electronics
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Amazon.com: beyerdynamic DT 990 Pro 250 ohm Over-Ear Studio Headphones For Mixing, Mastering, and Editing : Musical Instruments
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