I've linked link (I imagine most have read it), because it does have a spectrum within which doesn't show any real "holes" (although there is no mention of who or how it was measured).
It's fairly unusual for B&O to receive praise in the audio press and most are ready to knock it down - the BL9 does fair quite well, not only in this but also in other reviews from hifi mags etc.
I can only assume there's some sort of environmental factor at work.
Well, we will never really know if B&O decided to try the BOSE trick, and pay some publishers for these reviews...