1. calculating port and volume, HELP ME!!

I'm using this calculator to get my port length. I'm wanting my subs to see a final volume of 4.5 cuft with a tuning of 31 hz. Its giving me 30.85 inches. Do I need to add the volume of the port to the 4.5 cuft to get the final volume of the box?

PS- my old thread was a dead thread, so i started a new one with a more exact question.

2. Re: calculating port and volume, HELP ME!!

what size and how many ports are you using?

and yes, so need to add the port displacement to 4.5 to figure out how big of a box you need to build.

3. Re: calculating port and volume, HELP ME!!

yea you need to add the disp. of the length of the port/s to the box.
(if the ports will be internal)
what i do is go back to the box calc. and try to add a few inches to the box.
to make up for the disp. on the ports, dont forget woofer disp.

im still learning so if im wrong correct me lolz

4. Re: calculating port and volume, HELP ME!!

so, if I want my subs to see 4.5 cuft, i need to add the subs displacement and port displacement.

4.5 cuft. + .14 cuft. (subs displacement) + 1.01 (2 6" round ports @ 30.85") = 5.65 cuft.

And the only thing that is left is adding in the bracing displacement.

Is that right?

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