Just for the record... Mark from Mach5Audio just emailed this to me. It's the diagram for 1 cubic foot ported box tuned to exactly 33Hz! Thanks everyone. I'll try to find that fabric at autozone tonight. I don't see any way for me to upload a pic from my hard drive.
I could build the box myself, but I have a few questions. Does the 1 cubic foot include the port, or is the main chamber 1 cubic foot. Also, what dimensions would I have to make this thing so that it's 33hz? Anyone have a blueprint of a suitable enclosure? Or could anyone link me to something for sale online?