Just wanted to say hello first! I have been reading posts for about a month now...I have a Klipsch SW-12 sub....I am starting to hate the sound of it...just does not sound true. I want to build my own now and need some advice. My room size is 14x26...I want this for 80 percent home theater....around 500 dollars or more budget. I do not consider just because a sub is loud that it is good...I want to listen at low levels and sometimes at reference lvl's when wife is not home (if you know what I mean)..hehe A good sub to me will rumble the house at low lvls also. 1. I see most people build the 12", why not 15"? 2. I see allot of people building the sonotube...which sounds better, tube or box? 3. What would sound the best, a PR, sealed,vented or tube...I would prefer the tube, but I do not want to sacrifice sound quality.