Well I want to build a ported box to hold my two Pioneer TS-W255C. From what I've found each sub needs .99-1.21 cubic feet in the box. Also the port (a round one for one sub )needs to have a 3" diameter and 8" long.

I'm wondering if someone could help me with a program or something that would tell me what size sides I need etc etc.
Also were would I go to get a port to put in the box or do I just make one?
If I use one chanber for both subs do I just need one port? Would it be twice as large? Would it need to be in the center of the box?

I think that's about all my questions for now. Thanks for the help.