Since my MFW-15 bit the dust a couple of weeks ago, I am now looking for a new sub, and will probably build my own as I believe that I can get much more bang for my buck. With that being said, I need design idea's. I have read through much of the database here in the DIY forum and while there are lots of designs to choose from, I have no idea which would give me the best bang for my buck in terms of digging down low and having some decent output? I want the sub to go down to a least 18hz, and also be able to have some pretty good output as well. I at least want the sub to equal my MFW-15, if not exceed it.. I also need suggestions on which driver to go with, my budget is $350 for the driver, $300 for the amp. What ever the materials end up costing, is fine. My room is 18 x 14. Suggestions?