Hey to everyone, this is my first post. I am about to make a subwoofer purchase and due to all the outstanding reviews on this and other forums I have decided on an SVS. My question is which one should I get? I am currently trying to buy a 20-39 pc+ used from an individual but I dont think I will be able to pry it away from him so I have to make a decision. My livingroom is an acoustical nightmare. It is 15.5 x 15.5 with a 10 ft ceiling. It also has 4 doorways going into other rooms(old farm house), actually 5 but we keep one of them closed. The other 4 have no doors to close. I am deciding between the PB10ISD, PB12ISD or the 20-39. The $599 pricetag + shipping is my absolute limit. My question is which one for my room? Would the PB 10 be enough to fill my room or will I indeed need the PB12 or the 20-39? If I need the bigger sub then which one? If the PB10 will fill it would it be enough of an upgrade in deep full bass to still go with the bigger sub? Opinions? Suggestions?