I don't seem to be able to make up mind and would appreciate some expert advice. I have a set of 6 Anthony Gallos and need a sub to complete the system. Sub size is not a problem. The room is large approx. 5m x 8.5m. How do the SVS PB12/Plus Vs PB12/Plus 2 Vs Monolith compare ? I would guess the PB12/Plus 2 will fill the room more but I have heard that the Monolith is loud and low as well.