yup another port help question :)

[lilwikidj666]

I just ruffed this up tonight its 4.3 cubes without sub (zv4) port(2. 4" areo) or brace displacement. Ok trying to keep it in the 35 area or lower ruffly how long do I need them to be

[49konvict]

12 inches each will get you right around 32hz.

[666WMD]

Just for future reference, flared ports like those are measured from the halfway point of the flares.

[lilwikidj666]

Since every calculator gives me different answers can someome give me the equation for port designs

[49konvict]

Man its a long equation. Just Google that bitch. I'd rather not fawk it up posting it on my phone.

[lilwikidj666]

Got ya I cant find the displacement on my sub either I thought I found a site that said .85 cubes seem legit?

[southerntrendkill]

I dont know forsure but its definatley possable as they are huge subs andd take up quite a bit of space in the box. And this being that your talking about the Su.down ZV.4 12"



Wait.... .85?? That actually seems really big
. i dont know man lol wait for someone else to post a out that..

[666WMD]

Taking the dimensions (in mm) and calculating the cylindrical area the basket and motor displace, then converting to cuft, I get 0.604. Take into account the shape and air not being displaced, I'd say they'd be closer to half a cubic foot or less.

[lilwikidj666]

That definitely seems more believable than . 85 thanks

[jwc1486]

Psp-Inc.com has a calculator specifically for aeroports if u still need to figure that out

[jwc1486]

And according to that if you go 17 in total length you will have 32 Hz tune and with sub and port displacements you will have 3.5 cubes

[lilwikidj666]

I must of been doing something wrong it said I needed 21 in of port length

[lilwikidj666]

17 inches as in each port has to measure 8.5 inches

[jwc1486]

I put in 3.5 cubes with 32 Hz tune and 2 4 inch ports and it gave me 16.97.. that's weird lol

[jwc1486]

No it gives u the length of each port so each would need to be 17

[lilwikidj666]

O **** I was still using my gross volume oooops so each port 17 inches........maybe I should get 6in ports

[jwc1486]

6 inch would be hella long unless u were doing 1

[lilwikidj666]

Yeah just played with the numbers an found that out

[lilwikidj666]

Would one 4 inch port even be enough for that sub

[jwc1486]

Not for that sub .. def not enough

[lilwikidj666]

Didnt think so o well guess they will just stick out the top then

[jwc1486]

That might look interesting in that sonic hatch.. if they stick out make sure u take the volume change in to consideration and add being or whatever to bring ur volume back down

[jwc1486]

Bracing not being damn auto correct

[lilwikidj666]

Would four 2" ports at 8 inches be equivalent as two 4" @18" or will all the smaller ports create a bunch of port noise

[jwc1486]

No that would be half the port area and a lot of port noise