I am thinking about building a DIY sub to replace my paradigm ps-1200, and was thinking of using an adire tempest(a tumult would be nice but the whole $ thing comes into effect). I have never built a DIY sub before and I need some recommendations on what type of cabinet I should use, downward firing, front firing, PR, ported, sealed. Also some dimensions would be helpful so I know how big to build it, and if U do recommend porting where would I get ports from. I am very knowledgable when it comes to wiring the whole thing together so that is not a problem. I would like this thing play down to at least 20hz, 15 or so would be better(regions where my paradigm can't even think of touching). Also what kind of amp would you recommend using that is fairly cheap that will power this thing fine. By the way my use is 90% HT, and 10% music, so HT will be my biggest concern, music doesn't really matter since I don't use a sub for music much any way. Thanks for any info.