if I add +3db on low end frequencies the headphones become like 70% quieter than without EQ . If I apply values from Oratory's page, it is not that quiet. Even with Oratory's preset I am not satisfied how they sounds. It looks like something is missing, there is no details and crispness like without EQ (DT990). Or maybe I just prefer the headphones like they are from the box...?That one should automatically dial the gain to -3dB.
No matter what digital EQ you use it will always be at the cost of volume/output level.