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That's called recessed mids my friend, something that's inherenet in the DT990 sound signature.
Specifically, in the "presence" region around 5 KHz. It's the oldest psychoacoustic trick in the book, and one that just doesn't do it for me.
Looking at FR plots, it's also pretty clearly the explanation behind the AD700 soundstage. What I really want to sample at some point is the K701, which seems to give people the impression of spaciousness without, apparently, doing this. That intrigues me.