So like it says how do you figure out the right measurments for 2 or more round or square port? and im asking because im thinking of doing a dual L port design for a 12" BTL. box will be tuned to 34 hz and will be 2.5 cu ft after displacement.

so how do you figure out length and port area for each port?

also if you know how ot do the circle ports it would be nice to know that as well. because i might end up going the aero port route.

http://mobile.jlaudio.com/support_pages.php?page_id=165

ok that makes sense.

is there anywhere i can buy 5.5" ID aero ports?

im designing a box for a 12 inch BTL would 2 6 inch aero ports be too much?

the ports would have to be around 48" long each. or what else could i do? i would like there to be no port noise and im thinking that aero ports are going to be the best bet for me.

thanks for your help

ok that makes sense.

is there anywhere i can buy 5.5" ID aero ports?

im designing a box for a 12 inch BTL would 2 6 inch aero ports be too much?

the ports would have to be around 48" long each. or what else could i do? i would like there to be no port noise and im thinking that aero ports are going to be the best bet for me.

thanks for your help

Wow what is that box tuned at?

ok that makes sense.

is there anywhere i can buy 5.5" ID aero ports?

im designing a box for a 12 inch BTL would 2 6 inch aero ports be too much?

the ports would have to be around 48" long each. or what else could i do? i would like there to be no port noise and im thinking that aero ports are going to be the best bet for me.

thanks for your help

Wow what is that box tuned at?

i think it was 34 hz.

I've never seen any 5.5". Maybe some construction companies or something, but that's getting pretty obscure. I'm sure you'll be fine with two 6" aeros. But if you're worried about length of the ports, maybe try one 6" aero. That's about 28 sq. inches, that's pretty decent for a 12, and aeros help a lot.

Might try winISD. That program makes it pretty easy to see port calculations.

would 2 4" aero ports do it? i really wanna do 2 ports for looks.

I think that would work all right.