I don't believe he measured the combination as the amplifiers have ruler flat response regardless of load... he just felt they sounded rolled off with B&W's. This is odd to me because I usually find B&W's to sound bright.
I can't explain what he heard as I've never tried any of our amplifiers with B&W models... I've only heard them at shows, etc.
We have several customers using the combo's mentioned and are happy with the results, but everybody likes something different. On the other hand, he loved them with the Maggies and everything else he tried them with.