View Full Version : Help with external port...

03-08-2010, 02:25 PM
so i built a box for a buddy of mine that he wanted ported, but i cannot figure out how to make the external port. the box is 32" wide x 13" deep x 12" tall. which is 2.13 cubes. so around 2 cubes with sub displacement. i need help figuring out what size to make the port so it gives me a 30hz tuning or any tuning good for daily wangin. box is for a 12" p3 or 2 10" type r. here are some pics to show u guys what i"m looking for...

box with no port...


box with port style that i'm looking for...


don't mind the measurements i couldn't get sketchup to give me the correct ones. thanx in advance any help is appreciated...:)

03-08-2010, 03:13 PM
port area is gonna be pretty small to make the port length useable,,,a 12.56" port will be 15.88" long or so

03-08-2010, 03:23 PM
**** thats long. so theres no way it would work?

03-08-2010, 03:31 PM
not with a 30hz tuning,,a 28.26" port the same as a 6" round port would be 38" long.your gonna have to raise your tuning or build a bigger box

03-08-2010, 03:37 PM
go to davetheboxguy.com

hes will know

03-08-2010, 04:31 PM
well whats a good frequency for two type r tens or one rockford p3? for daily listening. im open to suggestions. pvc ports? i dont think he wants to spend money on aero ports being that i built the box for free. low ballin. as for a bigger box thats the biggest he can do. its going in a topless regal with hydroz. so trunk space is very limited with all the pumps and batteries in there.

03-08-2010, 05:15 PM
how long can he make his port?

03-08-2010, 08:26 PM
he said we can add 2.5 inches to the depth bringing it to 15.5 inches deep. 2.5 cubes. hope that helps

03-09-2010, 05:59 AM
here try going to this site and run a bunch of different port tuning sizes Precision Sound Products (http://www.psp-inc.com) use the port calculator.