Correct, I do realize that which is why I posted the thread asking that question.
I'm looking for alternatives for 2 more subs, either 2 more R210s/212s, or now sealed SVS SB-17 or Paradigm XR-13. The SVS seems to offer the best value with fantastic performance/output. Being from Canada, the $ does play a factor.
Ideally I did want all 4 subs to be the same but it might not be that crucial. Appreciate the feedback