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Archimago's Musings: RETRO: Beyerdynamic DT 990, 600Ω, classic open-back circumaural headphones (circa 1991).
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Beyerdynamic DT990 PRO Open Dynamic Studio 250 Ohm Headphones : Amazon.co.uk: Musical Instruments & DJ
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beyerdynamic Dt 990 Pro Over-Ear Studio Monitor Headphones - Open-Back Stereo Construction, Wired (80 Ohm, Black (Limited Edition)) : Amazon.co.uk: Musical Instruments & DJ
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Custom Cans Uber DT990 headphones with modified drivers and detachable balanced litz cable ( XLR, 2.5mm, 4.4mm ) – Custom Cans Shop
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