Well, after lurknig here for well over a year, I decided that it would be time to act this spring. I wanted a new sub and used what I learned here and elsewhere to design a sub witha Quatro 15 driver, four inch Precision Port, and 240 PE plate amp. AS it happened, the driver went on sale as a DOTD before Christmas, so I got it and the Port. The 500 watt amp went on sale thenext day, and two members of anothe forum convinced me that it would be worth it. I wound up with the time off from Christmas eve through Jan 10. We got some breaks in the weather. So I designed a box with a program called BOSX CAD from this site http://www.audiodiycentral.com/tools.shtml The design was 31H X 22.5 D X 18.5 W. The sub is 9/16" shorter because the lumberyard cut one side 9/16" too short. I trimmed the other sides and made sure that my less-than-even cuts were on the bottom. I wonder how much mdf one has to cut to get enough sawdust to make a full sheet of the stuff. I put in a brace paralell withthe front and back and one from the brace to the front. I lined the box with poly-foam seat cushion filling. It came in convienient slabs, much like foam. I used Gorilla Glue to attach everythiing. I had some black enamel, so you know what I painted it with. I installed the goodies, placed the sub in the left front corner. That's the only front corner I have in the room. I used my Stryke test tone CD and venerable RS meter to calabrate it. (These were purchased to calibrate my original Tiny Mity.) I got it reasonably flat to 17.5 hz. (=/-5 from 17.5 to 80, where it crosses ove to my Polk RTi 38s). I could hear noise even at 12.5, but it didn't register on the meter. I haven't played a movie through it, yet, but most of the music I've played through it has been stellar. Saint-Saens 3rd Symphony was a real treat. My "The Bass and I" by Ron Carter did not fare as well. I plugged the port, which seemed to make everything blend better. It looks like I'' have some more adjusting to do. I wanted to thank everyone who posts here, especially about subwoofers, for the information AND inspiration.