Internal volume calculation

[Trev98]

i would like to know how does one go about calculating the internal volume of a dual 15 inch 3-way way speaker enclosure when the back width if different from the front ,in order to get the right tuning frequency and internal volume required for the 2 woofers .Is there a software i could use?

External Dimensions

High 42
Depth 21
Front width 17.5
Back width 13.5

wood thickness = 5/8

Image of the speaker in the link provided

 

[uraberg]

I'm not quite sure, but I'd think in this simple case, you can take the average width for your calculations.

 

[Dave R]

top view is a trapezoid. hope this helps.

 

[tsmith1315]

L x W x H

As mentioned, for a trapezoid use (w₁+w₂)/2 as the width, which is 15.5"

If those are external dimensions, subtract 1.25" off each measurement for internal volume.

Subtract the volume occupied by any internal parts, braces, speakers, etc.