Help

I posted this on several other forums but I didn't get an answer so I'll try here.

I'm buying a prefab ported box that is: W 17 1/2'' x H 14 1/4'' x D 16'' with a square port thats 2'' x 12 1/2'' for a 12'' sub that has a displacement of 0.83 cu ft. Can someone tell me what the box is tuned to? Or can someone tell me atleast how to calculate what the box will be tuned to?

I think the program WinISD can do it, but I think you might need more information than that to calculate what the port is tuned to.