How To Figure out box calculations

Look for x with a superscript y (or x with a y on top of it). Otherwise you'll have to look it up in your calculator's manual.

Alternatively, if you happen to be using Windows 9x, you should have the handy Calculator in your Start | Programs | Accessories menu. Load Calculator, click on the View menu then select Scientific mode. To enter, say, 2 to the power of 3, you simply press:

2 then the button x^y then 3 and then press Enter key or = to get the result.

If you would like to see your design's theoretical performance, plug the numbers in any of the following free software

winISD Pro --
Unibox --
Subwoofer Simulator --

hth and good luck :)