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Beyerdynamic DT-770 Pro 250 Ohm +Presonus HP60 6 Channel Headphone Amplifier Amp 613815972754 | eBay
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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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