volume of odd shaped box?

Long time no see... I believe it's been maybe 5 years since I was here last.

I finally got a basic system in my car so many years later.


Long story short, the box I have is shaped funny and I need to know the volume because I think the port size is wrong as it makes a kind of chirping noise at loud levels. This goes away when I shove my arm in the port thus making it smaller.

The box is kind of shaped like this, sort of a trapezoid.



how do i find the volume of this shape?

I think i just found a calculator here that will help me

EDIT

Nope, not quite the same....wouldn't give me accurate results.

Divide it up into rectangles and triangles. Or put some inside dimensions on the drawing, along with the inside width and tell us if it has a divider.

or buy enough shipping peanuts to fill the enclosure. Build a 1 cubic foot box and begin dumping the peanuts into the box. Count the number of times the peanuts fill the box.

I think I got it.... I used the calculator available here. It occured to me that the angles themselves shouldn't make a difference to the volume if the measurements are correct, and this works out to 3 Cubic Feet.

so using the port calc, a port of 4" dia 9.25" long should be tuned to about 30Hz.