how much air displacement a speaker will have once it is in a box? I have looked around but can't find a simple, straightforward answer. Thanks.

Mook

 

Check the manufacturer's website, they should have the sub displacement with the specs.

 

Thanks, I will do that.

Mook

 

http://www.mfr-eng.com/toolbox.htm
This is a site that gives you a subwoofer design toolbox for calculating volumes and building you own. Haven't tried it, but searched for "subwoofer design volume" in www.google.com and found it.
Have fun!

 

length x width x height divided by 1728 = cu.ft.

 

Just to add to that. Those should be inside measurements. If you take the actually outside measurements, you will need to account for the thickness of the wood you are using and any dividers and/or braces used inside the box and also the displacement of the woofer. Most manufactirers publish those in their specs. If you can't find it for your particular woofer, then find one that is similar in design and the same size and that will get you close enough.