Ok I came up with some measurements for my "NEW" box. 14.5 tall x 20 deep x 21 wide or long. The port will be 13 high x 2 wide x 28.5 long. I want it tuned to 24 hz (as recommended by trixter). I got around 3.6 or 3.7 for the cuft for this box. Just wondering if that is all right for the B12.