Box Help!

[Jonahdude]

I'm planning on building a box that's 3ft^3 (after sub displacement) for two Pioneer TS-W305Cs, but I'm not exactly sure how long to make the ports. I'm thinking I'll use two 4" ports, with the box tuned to 35hz, which means each port should be 15.5 inches according to this calculator. Does that take into account port displacement? The longer the port, the more port displacement. The more port displacement, the smaller the internal volume. The smaller the internal volume, the longer the port needs to be. It sounds like a vicious cycle. HELP ME!!!

http://www.the12volt.com/caraudio/boxcalcs.asp

[Jonahdude]

Help? Please?

[sumone]

If I understand right, you want the total volume of the box to be 3cuFt + sub_displacement and port_displacement is included in the 3cuFt? that calculator takes in a number that does not include port_displacement. you have to know what volume the subs need. (Vb, not the sub_displacement)