You think that's big? Check this thing out. You have to scroll down a little.
http://www.royaldevice.com/custom.htm
http://www.royaldevice.com/custom.htm
Biggest Subwoofer Ever Made
I ran across this article about a 60 inch subwoofer. What kind of bass traps would you need for this thing?
http://www.ohgizmo.com/2006/03/06/the-biggest-subwoofer-ever-made/
http://www.ohgizmo.com/2006/03/06/the-biggest-subwoofer-ever-made/