I dont understand aero ports or whatever?..

[Jd377 6]

Oh ok haha I was just like what.. But yeah examples are good. I am also on my phone 4 now

[Jd377 6]

Ok so I want to order my aero ports but I need to know how many I need first.. I still don't totally understand how to figure it out so If i tell you the box specs can someone help me know how many I need and how long to make each one?

I plan on buying 4" aero ports from this site: http://www.parts-express.com/pe/showdetl.cfm?Partnumber=268-352

My box is going to be 29"x15"x22" I typed it all in and it is like 4.5ft^3 but after displacements it would be about 4ft^3

So if my box is 4ft^3 and I want to Tune to 30hz and put in 4" aero ports, how many do I need? and How long would each one need to be?

If a different size is better.. I believe they have 2" and 3" aero ports as well.. Please help I want to get these ordered so they are here when the subs get here monday!! ( 4 SA-10s )

Subs up, ports back towards my hatch

[Shogen 325]

your calculations seem off JD... I plugged in your dimensions and just subtracted sub displacements (.48) and the box is left with 3.92 cubes... If I were you, I would increase one or two of those dimensions by an inch ... Most likely height and depth you might be able to do... At least according to Torres' calculator ... I see your total "gross volume" at 4.96 cubes.. And 1 6" port would provide you with 7" of area per foot... With a length 16" you would get about 30Hz...

Am I wrong here?

If you did 2 4" ports you're looking at about 6.15" of area per foot... With a length of 14" giving you 30Hz ...

Hope I'm not giving misinformation as I am only reading what the program is giving me...

[S.DeYoung 968]

I would go with one 4" port per subwoofer

[Jd377 6]

So if I did 2- 4" Ports, you said that would be 14".. is that 14" long per port, or 7" long per port equaling 14" total? Like would I make each tube 14" long inside the box or each one 7" long in the box?

[S.DeYoung 968]

You are not going to get away with two 4" ports. Go with four 4" or two 6"

[Shogen 325]

They would each have to be 14" long... And let me plug in 4 - 4" ports and see what I get..

[Jd377 6]

If I did 4-4" ports, how long would each need to be in order to achieve 30hz? the way the programs say it, confuses the crap out of me.. because when it says like for example.. 4ft^3 and (2) 4" ports, port length needs to be like 15.6"... the # that it says the port length to be, is that per port or do you divide that by how many ports you have? Like if you have 3 ports and it said you need 21", would you have 3 ports 7" llong, or all 3 are 21" long each..

[Jd377 6]

because I thought for 4 - 4" ports they would each be around 28-32" ( estimating ).. the box isnt even like that wide lol, So how could I fit 4 - 32" long ports in a 30" box...

So thats why I was wondering if you divide the total ( 30" ) by 4 ports? .. if they each have to be the full 30" then I cant do 4 ports..

[Duran 387]

Per port.

[Shogen 325]

You are not going to get away with two 4" ports. Go with four 4" or two 6"

with 4- 4" ports you're looking at 36" in length which I think Sean is right, 2 ports is not enough area at least from other woofers I've seen plugged into here... Going with 2- 6" ports would require alot more length...

[Jd377 6]

The length I have to work with for the length max the ports can be is like 22" thats from my hatch to my back seats basically.. max I can fit for port length per port.

[Jd377 6]

Could I do (4) 3" ports?....... I have enough length to do those..

[S.DeYoung 968]

What is your enclosure volume - sub and port displacement?

[Jd377 6]

I guess its about 4.48ft^3 after displacement

[S.DeYoung 968]

If you do two 6" ports and don't cut them at all (17") you will be tuned to 40hz

[Jd377 6]

I wanted to tune low for this build like 30

[S.DeYoung 968]

I would use a slot port then it's going to be hard to achieve what you want with aeros

[Duran 387]

Remember, when you have adequate port area you have the ability to generate more pressure even if you tune a bit higher

[Jd377 6]

So the more port area the better? Or if you get too much can it be bad again? Maybe I'll try to see if I can squeeze a few more inches per side and increase volume to get down a little and still keep port area up

[Duran 387]

Yes, too much and you lose efficiency.

[Jd377 6]

Is there a website or some way that I can use to figure out how much port area I need that I can use over and over to figure out how much I need for this and future builds? im trying to learn so that I can know these things to help others and myself in the future! Thanks for all of your help as always!!!!!

[S.DeYoung 968]

The one I linked earlier works well

[Duran 387]

http://www.carstereo.com/help/Articles.cfm?id=31

[Jd377 6]

Wow thanks guys! Really appreciate it! I'll make sure to take pics of everything in a build log once we get it building. Subs should be here Monday and box building to follow soon after!