I now really belive in BURN-IN and this can need serious burn in. Why? I have just gotten myself the 600 ohm version. And the scenario is repeating itself. You know last summer i got the 250 ohm version. I though it sounded reaally good.. until maybe 30-50 hours. Then all suddenly it turned into a harsh sibilance and lean pice of can, and I thought, No no no, now I understand, all this flaming about beeing silbilant and harsh. I was devastated and but couldnt do anymore than just do some extreme EQ-ing... I still wanted to enjoy music.
And this is were I am know with my 600 version.
But the after long long time, sure more than 500+ hours, maybe even 1000+, all harshness got away. And my 250 started actually to sound more like a neutral phone. That boomy bass was gone to. I could throw my extreme EQ settings and just leave -2db in the 8khz zone. Cause HDP + DT 990 is by itself a little bright combo. I actually thought it wasnt burn in though, I thought it was my ears that had apdapted to the headphones.
But now, when i have a new pair of 600 this scenario IS repeating itselft. I probably have 100 hours on them now, and they are silbilance as hell. If my ears had apdapted to the 250´s i shouldnt think that my 600 ohm is silbilance and harsh, but now thats the only thing they are.
Now i only have to wait...