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Amazon.com: beyerdynamic DT 990 Edition 600 Ohm Over-Ear-Stereo Headphones. Open design, wired, high-end for use with headphone amplifiers : Electronics
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A Comparison of Beyerdynamic DT 880 32 ohm, DT 880 250 ohm, and DT 880 600 ohm Headphones Page 2 | Stereophile.com
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A Comparison of Beyerdynamic DT 880 32 ohm, DT 880 250 ohm, and DT 880 600 ohm Headphones | Stereophile.com
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