If you are considering buying a pair, make sure to read this Beyerdynamic DT-990 Pro review beforehand.
Archimago's Musings: RETRO: Beyerdynamic DT 990, 600Ω, classic open-back circumaural headphones (circa 1991).
Beyerdynamic DT 900 PRO X headphones review: Brutally honest sound for under $300
Beyerdynamic DT 990 Pro 32 ohm vs 250 ohm: All doubts Answered!
Beyerdynamics DT 990 Pro Open Back Studio Headphones
Beyerdynamic DT 990 Pro 80 Ohm Headphones Review
Got the DT 990 Black Special Edition (250 ohm) for Christmas. They are my first open back headphones and I am having lots of fun with them :D : r/headphones
Beyerdynamic DT 990 PRO Review
Beyerdynamic Dt 990 Pro Studio Headphones (ninja Black, Limited Edition) Bundle : Target
beyerdynamic DT 990 PRO 250 ohm - LIMITED EDITION (Black, Straight Cable) : Musical Instruments
Review: Beyerdynamic DT 990 Pro Open-Back Headphones
beyerdynamic DT-990 Pro 250 Ohm – Thomann United Arab Emirates
Beyerdynamic DT990 Pro (250 ohm) - Sometimes Things are NOT Like What Everyone Told You!