If you are looking for headphones for mixing and don't wish to spend a fortune, consider buying the Beyerdynamic DT 990 Pro Headphones.
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beyerdynamic DT 990 Pro 250 ohm Over-Ear Studio Headphones For Mixing, Mastering, and Editing : Musical Instruments
Beyerdynamic DT 990 PRO 250-Ohm Studio Headphones Review - TechWalls