calculator for port size and length of box or tube

Here is the equation I use so you can make a calculator

input = Radius of Port (R), tuning frequency in Hz (fb), Volume of the box in cubic inches (Vb)

and the length can be computed by:

L = (1.463 * 10^7 * R^2)/(fb^2 * Vb) - 1.463R

Note this is an approximate equation that generally gets you in the ball park, but if you are using flanged ports and different geometries other than a standard "box" there are other optimization techniques that can be done.  I do a bunch of my modeling using a variety of genetic algorhytims I wrote using the toolboxes in Matlab that seem to work pretty well, let me know if this will work, it is the standard equation from my favorite book  "The Loud Speaker Design Cookbook, by Vance Dickason" :)

Craig

Hey 12volt,

Good idea with the series and the parallel calculator. I'm sure that should clear up alot of headaches for some.