my first pair of Hi-fi headphones (and potentially my last) I was nervous about picking the Dt1990s. Every review states them as over analytical or fatiguing to listen to for long periods of time.
I picked mine up for half off on Ebay as they are quite old now! The Dt1990s and beyerdynamics in general is known for its sharp treble peak around 8khz. I was after good imaging, and after a relativley poor
experience with Sennheiser Momentum 4's i was unwilling to face their veil again. Knowing also that these things would get tossed around my room and potentially fallen asleep with, the tanky build of the 1990's was incredibly appealing to me.
My previous experience with hi-fi audio was very lacking. As for consumer headphones I've owned Bose NC700's, M4's, and airpod pros. While these were nice for frequent flights and the life of a college student, laying down in bed and closing your eyes with a pair of NC700s on leaves a lot to be desired. While I can appreciate a punchy bass, I love crisp vocals but most importantly strong imaging and seperation. Apple's spatial audio is nice on the airpods while walking to class or working out, but the perception of tracked speakers in your ears can feel gimmicky after a while and leaves you desiring to hear how the producer intended the song to be mixed. My Dt1990s came with only the balanced pads, so thats the perspective this is all from.