Currently have a 7.2.4 setup using 2 PB 1000’s placed diagonally at front and back of listening area. Running Paradigm Premiers up front and various other Paradigms everywhere else. My listening area is roughly 12x30 with 7 ft ceilings, however the total size of the room is roughly 18x35 with 7 1\/2 ft ceilings. So the total room area is roughly 4000 cubic feet as it is not entirely symmetrical. Initially wanted to add 2 more pb1000’s but they have been replaced by the pro model. So I’m wondering, would the addition of 2 pb1000 pros to give me 4 subs pressurize my room better, or should I look at replacing my current subs with PB2000 pros or Monoprice 12’s. Will any of these options improve my bass output considerably over what I have now? I have been happy with the dual 1000’s up until now, but I think I might be missing that chest pumping thump thing. The other issue is that I live in Canada and the prices here are quite a bit more than in the US. Any help would be appreciated. Thanks.