I've yust received my pair of dt-990pros, i was astonished by the build quality of those cans, they are sturdy as they were carved in stone, all steel headband, solid plastic cups, beautiful velour pads.
Sound quality-wise i've tried them
unamped - so those are just first impressions - and compared them with my ms1, obviously they offer a completely different sound signature, emphasis on highs and bass, slightly recessed mids, thus making especially vocals a bit thin , depending on the vocal range, hgh pitched or female vocals sound awesome for example...
Here comes the point where "different sound signature" becomes a "worse sound signature " , i am very sensitive to low frequencies, i hate bass, but i can stand sounds that others may consider sibilant and harsh ( i love my ms1
), so i found that -to my ears- some genres are completely unlistenable on the 990, i tried listening to some Death metal and i heared only double bass drums overpowering everything else, Nile's "Annihilation of the wicked" was unbearable unless at ridiculously low volume levels...before purchasing the 990s i read lot of reviews which described those cans as not suited for some genres, and in my opinion they are true, i would not recomment those phones to anyone who is into Extreme metal...but they might as well suffer from the lack of amplification, those are just some impressions i wanted to share with you...
Summing it up i am quite satisfied with my purchase, because - knowing the flaws of the 990s - i needed a pair of phones for my vinyl rig where i listen mostly to prog/hard rock, genres which can be handled well by the 990s, on par with, if not better than my ms1...but i'll wait an amp for more in depth analisys. After trying a different sound... i had the ultimate proof that my ears are better suited for a grado sound, i made my father try the 990s and he didn't find them bass heavy at all...what matters is everyone's hearing, there's very little objective in reviewing phones..