im planning on making my own box for my btl. but im not really sure on the port at all.

so here is my question

im planning on making a box with about 4.5 ft3 of air

35.25L x 18W x 17H

how big should i make the port if i want to tune it to 32hz? like the outside length and width, and the internal length of the port

thanks

if you have any suggestions ill gladly take them

this might of been posted before but the search hasn't worked for a couple days now

With those exact dimensions you can get about 4.2 cuft after port displacement.

But the after sub displacement you will be looking at 4 cuft.

I'm using the RE box calculator for this btw, I used it with my box and it turned out perfect.

It gives you the box cutouts and everything.

click

Because of the shape of the box the port width would be 3.5", the box is 18" deep so the actual port piece would go back 15.5".

The 2nd piece of port will be 8 inches long and it should run parallel with the back piece of the box.