Keep in mind that the DT 990 is sibilant even to people who like treble-forward headphones. It's not a headphone for everyone.
Also the DT 990 pads are notorious for wearing out quickly. I have to change the pass on mine every 2 to 3 months as they become so flat, the driver cover starts pressing on my ears. This doesn't apply to the DT 770 as the pads have a stiffer foam on the inside. In comparison, my HD 599 pads last about a year and a half before I need to replace them.
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StanGenchev t1_j9eq81n wrote
Keep in mind that the DT 990 is sibilant even to people who like treble-forward headphones. It's not a headphone for everyone.
Also the DT 990 pads are notorious for wearing out quickly. I have to change the pass on mine every 2 to 3 months as they become so flat, the driver cover starts pressing on my ears. This doesn't apply to the DT 770 as the pads have a stiffer foam on the inside. In comparison, my HD 599 pads last about a year and a half before I need to replace them.