The Beyerdynamic DT 990 Pro is a popular pair of open-back studio reference headphones for mixing, mastering, and critical listening.
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New owner of dt990 but a little disappointed : r/headphones
Archimago's Musings: RETRO: Beyerdynamic DT 990, 600Ω, classic open-back circumaural headphones (circa 1991).
Beyerdynamic DT990 Pro 250 Ohm Headphones Review, by Alex Rowe