I knew that title would get your attention. What I mean is, our office is remodelling and I stumbled across a base for a table made from 18" sonotube and capped on both ends with mdf! And finished in black laquer! And here is the best part: It has a perfect circle cut out of one end! It was just calling me from across the office... "Dave! Make me into a sub, Dave. Pleeeese!" I figure the internal volume at a little over 2 cuft. Only problem is, the circle cutout is 12" and I can't find a driver that requires a 12" cutout. Anyone know if there are any 13" drivers out there? What am I getting into.