Amazon.com: beyerdynamic DT 990 Edition 32 Ohm Over-Ear-Stereo Headphones. Open design, wired, high-end, for tablet and smartphone : Electronics
Beyerdynamic DT-990 32 Ohm Headset Black | Techinn
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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