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Archimago's Musings: RETRO: Beyerdynamic DT 990, 600Ω, classic open-back circumaural headphones (circa 1991).
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Best headphones for music producers, Beyerdynamic DT 990 Pro Open Studio Headphones (250ohms) Review - YouTube
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beyerdynamic DT-990 Pro Acoustically Open Headphones (250 Ohms) and Knox Gear Compact 4-Channel Stereo Headphone Amplifier Bundle (2 Items) : Amazon.sg: Electronics
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Beyerdynamic DT1990 PRO Open-Back Studio Reference Headphones | Studio / Monitoring Headphones - Store DJ
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Beyerdynamic DT 990 Pro 80 Ohm Open-Back Studio Headphones Limited Edition | Derringers Music Australia
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