I have talked with Ron and Tom over at SVS and after giving them the dimensions of my room, they both said to go with the 20-39Pc+. I will place a order in two weeks. You guys were right they have excellent customer service! Something that alot of corporations need to learn all over again. My question is. How do you 4ES owners like this combo and how did you go about setting up your sub? Sorry that would be two questions.