I think I caught the DIY bug from you guys and I want to build a sub (or two). I have two plate amps rated at about 150 watts each, and would like to build one or two subs that provide a noticeable improvement over my current Infinity BU120. The room is about 12x25 (long) with 9 foot ceilings. With the plate amps I want to use, I know I will need something fairly efficient. No wife,so no WAF to deal with (yet). I would appreciate any help or guidence. Suggestions?