Archimago's Musings: RETRO: Beyerdynamic DT 990, 600Ω, classic open-back circumaural headphones (circa 1991).
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Beyerdynamic DT990 Pro 250 Ohm Headphones Review | by Alex Rowe | Medium
Beyerdynamic DT 990 PRO review | MusicRadar
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Beyerdynamic DT 990 PRO Review - RTINGS.com
