1. ## Re: Designing a ported box with George

*bump* for some help

2. ## Re: Designing a ported box with George

what do you want to tune it to?

=0.159*(((AV*(1.84*10^8))/((Vb*1728)*(Lv + 0.823*(Lv^0.5))))^0.5)

3. ## Re: Designing a ported box with George

assuming the 18.5 and the 16.5 are internal as well....you never said what you wanted it tuned at but 15" long would be 30Hz. and the higher up you go (tuning)would only make the port shorter.

4. ## Re: Designing a ported box with George

opps didnt relize i didnt say what to tune it to

i want to tune it to 33hz sorry bout that and thanks for some help

5. ## Re: Designing a ported box with George

33hz = 11.75in

6. ## Re: Designing a ported box with George

could you tell me how you got that so next time i dont have to ask for help please

7. ## Re: Designing a ported box with George

Av*(1.84*10^8)
______________ -(.823*sqrtAv)=port length
Bv*((Fs/.159)^2)

Av= port area(in^2) Bv=box volume( in^3) Fs=tuning frequency Sqrt=square root.

8. ## Re: Designing a ported box with George

yo jelly i am guessing this is for tube ports.

9. ## Re: Designing a ported box with George

thanks again

for slot port right?

10. ## Re: Designing a ported box with George

Originally Posted by Thuracine187
im gonna be making a box for my 2 12w0 in the near future. Its gonna be all 1 box with a divider so each sub will have about 2.3 cubic feet and its own port. the port legth is where i get the problem.

my max width for the whole box is 40in and gonna be using 3/4 mdf with a divider so thats 37.75 internal width

40 - 1.5 - .75(for divider)

each sub

width = 18.5
height = 16.5

port diameter = 5

when i plug all the numbers into the pL formula i get like 81.3in. that seems a little big to me. so if some could tell me if that is correct and if not point me into the right direction i would really appreciate thanx.
5" port diameter...and diameter isn't used for slots. so i just assumed he was using pvc or something...

11. ## Re: Designing a ported box with George

need lenght for slot port sorry that i wasnt clear about that

12. ## Re: Designing a ported box with George

tube, slot, triangle, whatever... shouldnt matter in the math. You just need port area and total port displacement.

13. ## Re: Designing a ported box with George

Originally Posted by Thuracine187
thanks again

for slot port right?
you didn't say slot. but a 16.5x2" slot would be 29" long still tuned @33Hz, but now with alittle over double the port area.

14. ## Re: Designing a ported box with George

**** jelly what program are u using or are u doing this all in ur head.

15. ## Re: Designing a ported box with George

im lost now

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