View Full Version : 7 inch port diameter

01-11-2007, 05:28 AM
Iknow theres been lots of questions about ports, and ive tried looking through some but cant find my problem. I entered my info into a port calculator on one of the links and it told me 6.7"diameter. I assume I need two ports as there is no way i'll be able to put a port that big on my box, but how big should they be?

mike dressure
01-11-2007, 05:35 AM
how big is your enclosure first off and second what are you planning on tuning it to

01-11-2007, 05:46 AM
enclosure is 2 feet, I have two 10" rockford punch subs (old ones that I never used). I know the box is a little small but was hoping to tune between 30-33.
I'm new to this, does it make a big diff in sound when tuning that low?

mike dressure
01-11-2007, 05:50 AM
try 2 ports 3 " in diameter. both the same length as what the calculator said.

01-11-2007, 05:54 AM
with two 3" ports it says 17 inches, however with one 3" it says 7 ". Will that just cause port noise? The subs are in a trunk so it probably wouldnt be noticeable and two 17x3" ports will still be hard to fit in a 2 foot box

01-11-2007, 06:00 AM
try 2 ports 3 " in diameter. both the same length as what the calculator said.

2 X 3" port = 14 sq. in. of port

1 X 6.7" = 35 sq. in. of port

Those 2 3" ports won't be the same length as 1 6.7" and achieve the same tuning.

01-11-2007, 09:01 AM
1 4" aeroport FTW!

01-11-2007, 01:12 PM
What are the exact dimensions of the box, and what is the thickness of the wood?

01-11-2007, 03:48 PM
26"x17x15(bottom)x9(top). It is slanted to fit in my car. Also should the subs face the seat or the trunk.

01-11-2007, 03:49 PM
3/4" Mdf

01-11-2007, 04:21 PM
sorry, after looking at my dimensions, the box is 3 feet. Its still a little small.

mike dressure
01-11-2007, 04:25 PM
actually if it is 3 cubes it isnt to small. but you will need to do your calculations over again. what is the dimensions of the enclosure. i may be able to do this for you

01-11-2007, 04:35 PM
26"x17x15(bottom)x9(top), these are the outside dimensions

01-11-2007, 05:13 PM
4 inch aero port at 13.8 inches will get the job done in that enclosure.

I get a final volume ~2.25 after sub displacement.

01-11-2007, 06:50 PM
2.25 after sub displasement. Is that big enough? Will I lose spl or sql since its supposed to be 1.5 per sub?