Does anyone know anything about this model SVS Sub (25-31PCI)? I sent an inquiry to their tech support and they recommend this sub or the PB-10 for my room. The tech said that the PB10 will extend down to the 16-18hz range and clean output from 106-112db. The PCI will go 21-23hz but will have 3-5db cleaner output. Which one is better for movies with good sound effects? Any opinions. Also with a cylinder sub what is the general rule for placement? Thanks