Can anybody tell me where to go about finding the tube around Detroit? I know, call local construction companies and whatnot, but I was hoping that someone would have an easier way. Lastly, i know that there are a million and one sonosub threads these days, but I don't plan on building a full-out-huge sub...just something that will do the job well...I haven't played with Adire's software yet, but could someone advise me as to what size I'll end up with? Say, an 18" tube, maybe 2.5 to 3 ft tall? What freq should I hope to hit, with proper tuning...and I haven't had any experience with DIY, so I don't know what to say about all the ports and stuff. Some more questions: I hope to spend at max $200 on the sub, since I have other upgrades in line (receiver, speakers should total $800), so what type of driver would/should I be looking at? I know that a plate amp will cost $120, but I don't know how much the tube and MDF will cost (I have the university's wood shop at my disposal, so no tool costs, other than the cheap daily rate of the shop), so I don't know how much I'm looking at. Maybe someone else has built an economy sonosub? Smaller driver, maybe 10" (hoping for 12"), PE amp $120...MDF and tube...is this a manageable dream for $200? Thanks all, my apologies for adding to the newbie sonosub pile, but it's about time I start getting my details straight.