Based on research and all the glowing reviews on HTF, I've decided on an SV subwoofer for my soon to be completed HT. Question is how do you know what you need? Here is my particular setup. My room will be 12 x 26 with 8' ceiling, acoustic tiles and carpet. This is a basement with concrete for subflooring and left and front walls. The room is pretty much a perfect rectangle. I'm planning on a 92" screen so I'll sit about 12' back. I'm not sure if all this info is useful but how do I choose a sub for this setup. I want it to do the job but of course I don't want to play too much. Thanks.