UPDATE:
Upon rereading the article mentioned by the OP, I realized that while my two channel sub integration was set in stone, I did have the option to use Barry Ober's tip for the third sub that I use for redirected bass/LFE in the home theater application. Since the mains are 9 feet away from the listening position, I simply set that sub for 21 feet. Presto! The impulse waves match and now movies, television and video games are breathtaking.
