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Amazon.com: beyerdynamic DT 990 PRO Over-Ear Studio Monitor Headphones - Open-Back Stereo Construction, Wired (80 Ohm, Grey) : Musical Instruments
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Amazon.com: Beyerdynamic DT-990-PRO-250 Open Back Studio Reference Monitor Headphones Bundle with RockvilIe HeadRock Personal Headphone Amplifier Amp : Musical Instruments
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