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DT 990 is open.
i dont have the 7506 but even the z1000 (i didnt have too much listening time on that either, just got it along with the tbse) doesnt even seem to have a really 3d soundstage. im pretty positive that my dt990 has larger soundstage but thats an open back headphone. for you, i say, go for tbse.
DT 990 is open.