Alright so here's the deal. I am a senior in High School and to graduate, all senior must complete a "Senior Project". For mine, I have decided to create a subwoofer using the sonotube design. Because this is a school project I don't want to spend a whole lot but I am willing to but some decent $$ behind it. I was wondering if anyone had any base plans or good design that is not extremely difficult to build? Also, part lists or places to buy parts would be very nice. My current receiver is a Denon AVR-985s (Basically the 2805) so I dont know how that will play into this sub, whether it should be passive or not. If it is passive, I am not 100% sure at how to hook that up. I'm very new to this whole DIY thing so bare with me if possible and anything you could do to help would be much appreciated. Thanks!