The Beyerdynamic DT 990 PRO is a no-nonsense, open-back studio headset with a pretty spectacular sound for the price. I would love to use these on the go, but at 250 ohms, you need a decent phone amp to get the volume you need. The DT 990 PRO is advertised as almost identical to the DT 990 PREMIUM, but there are a few differences which you may want to consider before buying.
The Beyerdynamic DT990 Pro Studio Headphones were made for sound enthusiasts just like you. These extremely comfortable open-back headphones have
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Beyerdynamic DT 990 PRO review
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Review: beyerdynamic DT 990 Pro Studio Headphones
The DT 990 has been made for listening without stress. This open headphone features a pleasant sound and brilliant bass. The DT 990 gives a three-dimensional sound, that is, it reproduces all details of the various instruments of an orchestra as a unity. You will experience an unique audio. Low headband pressure and a soft padded headband ensure a high comfort. The soft ear pads can be easily replaced.
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Beyerdynamic DT 990 PRO review - SoundGuys
Thomann just knocked 11% off the Beyerdynamic DT-990 Pro headphones - our studio cans of choice
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Beyerdynamic DT 990 PRO Studio Headphones