Quick porting question

[PapaGeno21 10+ year member]

Ok so basically here is the question.

4 cubes ported at 38HZ

One 4" port wants to come out at 2.94" for 38HZ

Two 4" ports for 38HZ comes out at 8.8"

Does that mean I make both ports 8.8" or do I make two at 4.4"?

Using this site.. Port Length Calculator

Thanks!

Click to read more...

 

[mklett33 10+ year member]

Hold on, something isnt adding up right... 4 cubes and the port only 4" long. I wouldn't use that site, use WinISD so that you can actually see your air velocity and prevent port noise...

Check out my video tutorial here:

 

[ssteele18 10+ year member]

Ok so basically here is the question.
4 cubes ported at 38HZ

One 4" port wants to come out at 2.94" for 38HZ

Two 4" ports for 38HZ comes out at 8.8"

Does that mean I make both ports 8.8" or do I make two at 4.4"?

Using this site.. Port Length Calculator

Thanks!

IF those calculations are correct(use his video), you would not split the length between the 2... If its day 3" with 1, it's not gonna be 4" each for 2.. They're approx twice as long when you double the aeros.

 

[mklett33 10+ year member]

IF those calculations are correct(use his video), you would not split the length between the 2... If its day 3" with 1, it's not gonna be 4" each for 2.. They're approx twice as long when you double the aeros.

Thats the rule of thumb I was thinking in my head, I would not trust that calculator.

 

[PapaGeno21 10+ year member]

Yeah I will be doing 2 ports at 9" long each. 4" diameter. Approx 37 HZ in a 4 cubed box.