I have always ran my 18 in my living room in a vented enclosure and I thought I would try somethin new in the house with the housewrecker plan.  is there another plan for 18s or how do I scale it?

I just downloaded the version II dated 7/07.  Does the 1.2 factor still hold?  Also do I use this factor to enlarge the port on top and the 2 bottom ports?  Planning on using one or two Mach 5 IXL-18.2.2 speakers.

Thanks for the help.