Sorry to bring this topic back to life, but I have more questions.

I have a relativley small theater room (11.5w X 17l x 7.5h). Would I benefit from a second sub, or just get a "better" single sub? What I mean is I have a Paradigm PS1000 (10" older model), Would I benefit more from another 10" or go with a single larger sub 12-15" ?