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Archimago's Musings: RETRO: Beyerdynamic DT 990, 600Ω, classic open-back circumaural headphones (circa 1991).
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Beyerdynamic DT 880 Pro 250 OHM Semi-open reference headphone - Reviews | Headphone Reviews and Discussion - Head-Fi.org
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Amazon.com: beyerdynamic Dt 990 Pro Over-Ear Studio Monitor Headphones - Open-Back Stereo Construction, Wired (80 Ohm, Black (Limited Edition)) : Musical Instruments
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Archimago's Musings: RETRO: Beyerdynamic DT 990, 600Ω, classic open-back circumaural headphones (circa 1991).
REVIEW: Beyerdynamic DT 770 vs. DT 990 headphones | The Wong Janice - Ambient Cello Meditation Music
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