Yes bass is about moving air, don't i know it, my SVS has two twelve inch drivers and weighs a ton.
http://www.hometheaterforum.com/topic/320206-paradigm-sub-2-subwoofer-review/
Another review.
http://www.audioholics.com/subwoofer-reviews/paradigm-sig-sub-2-1/paradigm-sig-sub-2-introduction...
I would put the Paradigm with it's six 10inch drivers up against any 18inch subwoofer and i bet it would sound better, i remember reading articles on the reason why smaller subwoofers stacked together sound better than one large subwoofer on it's own, i think they produce tighter bass with less...
The Paradigm Sub 2 uses six 10 inch drivers, they are better than two 15 inch subwoofers, more efficient at their job, the principle of more smaller drivers against one large driver is actually a good one, now 6 inch drivers, no too small, 8 inch drivers can work as the Paradigm Sub 1 uses six...
It all depends on your room size, for large rooms i would go for floorstanders but for small rooms i believe good quality stand mounted speakers makes perfect sense, yes you can get away with bookshelf speakers on a properly setup listening room, if you have a good subwoofer even more so.
At...