BoJon,

You said you like DIY and for much less than one sub you can build these two open baffle H-frames ( blue cubes ). The H-frame is nothing more than a 16x16x16 open ended cube with a 15 inch Eminence Alpha full range woofer mounted on a flat baffle at the mid section of the enclosure. The H-frames, unlike plodding subs, are fast and musical. These aren't something I made up so read Martin J.King's OB papers on the subject.