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Dozy_production
10-31-2006, 03:51 AM
Excuse my french but im a little distraught after watching a good hour on anti scientologist docuementaries.


So i have searched and use a couple of the calculators determining the relation to aero port length to its diameter. So the smaller the diameter the shorter the length is needed to achieve the same tuning? So what is up with people recommending a 4 or 6" diameter for one 12" when a 4" aero port (according to these calculators) can be used with the length of roughly 7.5 inches. i mean a 6" would mean the port to be 17 inches!


I want to get a 2.5 ft^3 tuned to 38 with a 12" hd3. Fyi.

j3bus2k3
10-31-2006, 03:59 AM
Its the same principle as slot ports. With less port area, you decrease your port length but with too little port area, you can cause port noise. Aeros are more efficient so you can get away with using less port area than their slotted counter-parts and the flares on both ends reduce turbulence. If you were in the chat earlier you would have gotten a nice lesson about aeros...

I'm no expert but for 2.5ft^3, I'd do 2x 4" Aeros

woody89
10-31-2006, 11:06 AM
Depends on how much sq. inches of port you want to. Roughly a 6" aero is equal to about 2 4" aeros. Etc....



I could be wrong.

Flipx99
10-31-2006, 11:09 AM
Depends on how much sq. inches of port you want to. Roughly a 6" aero is equal to about 2 4" aeros. Etc....



I could be wrong.


I understand that to be equivalent air flow, not equivalent area.

Army-Killa
10-31-2006, 11:10 AM
Off thread are you a Scientologist?

acold7dusta
10-31-2006, 11:11 AM
yea there was a nice lil chat for about a half hour on those last night on aim

Lakota
10-31-2006, 11:19 AM
I understand that to be equivalent air flow, not equivalent area.
The port area of 2 4"s and 1 6" is nearly the same, atleast not considering the flares.
(3.14)(2^2)x2=25.13in^3
(3.14)(3^2)=28.27in^3

nVRuckus
10-31-2006, 11:24 AM
Excuse my french but im a little distraught after watching a good hour on anti scientologist docuementaries.


So i have searched and use a couple of the calculators determining the relation to aero port length to its diameter. So the smaller the diameter the shorter the length is needed to achieve the same tuning? So what is up with people recommending a 4 or 6" diameter for one 12" when a 4" aero port (according to these calculators) can be used with the length of roughly 7.5 inches. i mean a 6" would mean the port to be 17 inches!


I want to get a 2.5 ft^3 tuned to 38 with a 12" hd3. Fyi.

if your putting a HD3 in a 2.5cuft box you want 4 x 4" ports or 2 x 6" according to audioque ;)

they want 40sqin of port area for a 2.5cubed box. and mind you this is after displacement to figure a larger box to get the 2.5 after sub and port displacement.

Dozy_production
10-31-2006, 11:38 AM
thanks for the input. Im still confused a little though so patience with me on this one. Okay so if i would go for 2 6" how long would they need to be? Pretty short? Couldnt i go with just one long 4" or 2 longer?

How does the length play into this is what im trying to say. If you any of you have a nice informative site you can post a link instead of explaining if you deem it neccessary.


no im not a scientologist. i posted that video thread.

djman37
10-31-2006, 11:41 AM
here's the weird part, the more ports, the longer they ALL have to be.

check out the calc on www.psp-inc.com

more ports = more air you can move = longer to achieve tuning.

Immacomputer
10-31-2006, 11:44 AM
There is nothing weird about that at all. The more round ports you add, the more port area. The more port area, the longer the length to achieve the same tuning.

The more port area, the lower the turbulence of air in the port. That's why people don't use smaller ports even though they will be shorter.

Johnny Drama
10-31-2006, 11:53 AM
4" areo is roughly 12.56 sq.in. not including the flare. (pie)*(raidus)^2=area of circle.
3 4" will give you ~38 sq. in. of port. Remember 12-15sq.in. per cubic foot is a good number for daily and 15-20sq.in. for SPL applications.

So...2.5 net @ 38hz with 3 4" areos would be each port being 26.22" long.

Dozy_production
10-31-2006, 12:32 PM
^^^^ where did you get the 26.22" from though?

Johnny Drama
10-31-2006, 12:34 PM
www.psp-inc.com (http://www.psp-inc.com)

or you can find the formula and do it by hand.

Dozy_production
10-31-2006, 12:47 PM
www.psp-inc.com (http://www.psp-inc.com)

or you can find the formula and do it by hand.

:thankyou:


Well mabye i shall sacrifice to a little bit more space for a reg slot port box. or get the aeros coming out of my back dash.