I am surprised that the OP read Richard Vandersteen's response as "pissed off." Every time I have corresponded with Richard, he has been helpful. I believe his response is related to the complexity of the question, as indicated by all the other responses. I know Richard is busy and considers answering customer questions quickly a high priority, as he mentioned once when I attended a Vandersteen seminar. By the way, I have Quatro CTs after many years of passive bass. And I am glad I made a move.
Physics Question: Why does cabinet volume matter so much to bass response?
If you put the same 8' woofer into a bookshelf speaker or a floorstander, you will get a different frequency response. Does anyone know what's happening with the air pressure on the inside of the cabinet to cause this to happen? Does the woofer in the bigger cabinet have greater excursion, and therefore produce more amplitude?