Im trying to design a box for my single 12". Its a NSv1 motor built with Zv3 soft parts. Will be at 1/2 ohm on a Sundown 3000.
This is the first time Ive messed with Torres box calculator. Normally I just draw shit and measure it, figure out airspace, then figure out port, etc. Guessing game.
So I have the box drawn up in sketchup, figured out my 45s to make the port length equal, and figured them into the displacements as well as the sub itself and the dowels I plan to use for bracing. .22 cubic feet total in displacements for 4 tiny 45s, 4 1.5" dowels, and the sub.
I did the math and heres what I came up with for volume of my box in sketchup.
The smaller rear rectangle is 2 7/8" x 14 3/8" x 12", comes out to .287 cubic feet. Bigger main front section is 6 7/8" x 33 3/8" x 12", which comes out to 1.593 cubic feet.
Total is 1.88 cubic feet. Subtract my displacements and you get 1.66 cubic feet. Port is 2.125" x 12" and is 30.5" long. Should put tuning at 34.5hz and about 15.36 inches of port per cube.
I put my outside dimensions into Torres, put the extra baffle in (it will go over the front baffle, including the port, I figured the extra 3/4" into my port length) put my displacements in, put 3 common walls as port, put the port size and length in. Using torres I get different numbers than the math I did earlier.
It's better to keep your mouth shut and give the impression that you're stupid, than to open it, and remove all doubt.
Mistakes are how you learn; try not to learn too much at any one time.