I think it would be good if the OP came back and clarified exactly what it is he's trying to obtain, because I don't think he's made that clear. Based upon his initial comments, I don't think has taken in measurements of his room to get an idea what's going. I highly doubt he doesn't have any nulls at all. When I read posts on various HT enthusiast forums such as this, enthusiast are either complaining about two much bass or not enough bass, regardless of the subwoofer(s) in use.
As for Gene's comments, I have much respect for him, however Gene is an avowed basshead.

Seriously, I wouldn't asking Gene for some question regarding his above quoted comments.
Anyway, I don't know why some of you are so upset, I basically agreed with the prevailing opinion in this thread, if he's looking
loudness at below 30hz (or HT levels) his subs are probably inadequate. However, everyone's isn't looking to shake the foundations of their house.