Originally I wanted to build a small high powered sub but came to the conclusion that it was going to cost to much and in effect defeat the purpose of building my own. So now I have a new idea. My current setup includes a Denon AVR-3803, Def Tech's all around, BP2006TL's for front L/R, CLR2300 center channel, and ProMonitor 80's for surrounds. The front 3 provide excellent bass and I certainly do need a stand alone sub. The idea of building one is so exciting that I want to give it a try. I want to keep the cost under $300. My question is would I be able to build one in my budget that goes lower than my main speakers? If not I was thinking of still making it but wiring it to my surrounds (would that be a low level connection or high level?) and setting them to large so that they provide more bass effects. I am veyr new at the DIY concept for speakers so try to keep that in mind with any suggestions. I would really like to make this happen so I would love to hear what some people with experience have to say. And if this turns out to be successful maybe I will make that high powered one sooner than later.