As Mr. Gross claims by slightly blending the subwoofers crossover region at a higher frequency to be beneficial in matching the main speakers lower frequency presentation. Simply by using my subwoofers Auto EQ feature followed by manually drag and dropping the subwoofers Frequency Response Parameters by ear. Easy.
Just as easy was determining the rooms ideal subwoofer positions which are, unlike Mr. Gross' claim of within (or near) the speaker, one of the worst locations in all of the rooms my system has occupied.