[72 cheyenne pdx]

In a sealed application, you need a volume of 1.5 cubic feet of space per 12w0 sub.

You can go the JLaudio.com and click on products, then subwoofers, then discontinued. click on the sub you would like to look at and it gives you the manual in PDF. It has the spefics on the sub and the deminisions to build a basic box.