Never ever use headphones for mixing or mastering, specially the dt990pros they are very good for listening to music in general (specially for the price point) but they are far from neutral. What you want for mixing mastering is monitor speakers and use your headphones as a reference for light ajustments. Otherwise you will make a fool of yourself (like me) showing you friends your awesome new song that sounds like it was recorded in the sewers.
Thanks Macebo,
I do my mixing and mastering with bookshelf speakers, then give my mixes the car stereo test which always results in adjustments. The headphones are a different test. I want my recordings to have depth and detail. It's a turn off the lights and get swept away by the music thing. That has resulted in mix changes too.
There are things I love and hate about the various cans I own. They serve me well in the studio but fail the critical listening test. So far the DT 990's are failing that test too but they are breaking in quickly and I'm hoping with a couple more days of use they will deliver the performance I am hoping for.
I am a difficult case though as I listen with great intensity and can't stand to be distracted by the quirks of the headphone.
There is a possibility I will have to save up and buy something significantly more expensive.