View Full Version : Port Decision. Help!

09-29-2005, 10:49 PM
From the choices, what would be best?

1- 4" flared, 6.55" long
2- 3" flared, 8.35" long
4- 2" flared, 8.02" long <not my favorite, cost a lil $

The box is 3.9 cu/ft tuned to 32 hz. Gonna have 2 12" Type R's runnin off ~1200w (dont get on me for jumpin on the bandwaggon, i have the older model now and like them, so i thought these would be pretty good as well)

I dont want any port noise, and the ports will be firing the same way as the subs, if that helps any.

09-30-2005, 06:43 AM
any thing less then 4 ports with 4" diameter is going to give you port noise.

09-30-2005, 03:32 PM
WHAT? that means i would have to have 4, 32" ports!!!:crap: thats definetly not goin to happen. I guess ill have to settle with some port noise.:furious:

09-30-2005, 03:38 PM
well you can always go with a 12" high 2.5"~ 3" width slot port most likely like 35"~40" long.

09-30-2005, 03:45 PM
A minimum of 2 4" ports. And you most likely will have a tad bit at high volumes.

Moe Lester
09-30-2005, 06:44 PM
ehh Id just build a slot port if you dont wanna shell out the money for 4 4" aeros. If you are set on getting aeroports, like trigger said, MINIMUM of 2 4" aeroports.

09-30-2005, 10:36 PM
This is what my bos is gonna look like. I dont have much depth to work with, so thats why i was sticking with the lengths i had. What do u guys think i could do. I would prefer the port to be in the middle, symmetry kinda guy.


sorry bout the pic, it took away some of the parts of the box when i converted it, buy u get the drift.

09-30-2005, 11:14 PM
besides whistling being an issue, how big of a deal in output would be a 10" diffrence in port area?

10-01-2005, 09:33 PM
well say if i didnt go with the flared ports and just used some 4" pvc, could i use some 90 degree angle pieces, or 45's, to get the tube to go where i need it to go? The length would be 14" for each port.

something like this: http://img369.imageshack.us/my.php?image=ports3rd.gif

The port would either curve back to the front of the box, or stop when its pointing up, depending on the length.

If it wouldnt hurt me doin it this way (curving the round ports), i probably could go with 3 of the 4"ports at 22.5" long and have them located at the middle, left, and right corners with the subs sitting between each on them.

.o.o. <<<like that

10-03-2005, 10:27 PM
bumpin it up

10-06-2005, 11:09 PM
bump come on guys need the info

10-07-2005, 12:21 AM
yes you can use the elbows to make it curved.

SSS 18734
10-07-2005, 12:24 AM
I have a 4" wide, 6.5" long deep port in each of my box chambers as of right now... no port noise whatsoever until it starts getting loud, but even then it isnt all that noticeable unless your close to the port.

why not incorporate a slot design into your box?

10-07-2005, 05:53 PM
Well, if u look at my box design, i dont really see a way i can put a slot port in it and it still look symectrical. It would have to go in the center, and IMO, slot ports dont look as good as a round port. I like having everything neat, and when u put carpet on a box with a slot port, the edges of the carpet are seen, and it looks tacky. With a round port (aeroport), the edges of the carpet are hidden by the flare and it looks clean. I even believe there is some sort of pvc fitting that has a "lip" on it, similar to a flare, and could be mounted to the outside, givin it a clean finish.

10-07-2005, 07:07 PM
may be this could work but its for 2 10" subs.
http://img190.imageshack.us/img190/8844/angledbox7vo.th.jpg (http://img190.imageshack.us/my.php?image=angledbox7vo.jpg)

with 2 3" ports.

10-07-2005, 08:28 PM
I like the design. If i used that design,which would have less turbulance, square or round?

10-07-2005, 09:07 PM
as long as the ports are sized right, i would not worry too much about turbulence.
unless you're like going to spl comps where you need every db that the box, port and sub combo can putout. with the limited space you have i would worry more on the tuning. and getting the most freq response. let it be loud and low. of course no port noise either.

10-07-2005, 10:43 PM
I might just take that box design and run with it. I was a little worried about making the end of the port look good, but since i am covering the box in vinyl, i can just make a piece that goes over the top and cleans everything up.