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PapaGeno21
10-18-2012, 10:44 PM
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 (http://www.mobileinformationlabs.com/HowTo-1Woofer-Box-CAL%20Port%20lenth%201.htm)

Thanks!

mklett33
10-19-2012, 02:12 PM
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:
http://www.youtube.com/watch?v=qJl3SDfuI9Y&feature=share&list=UU4FiN46mPTtkJxzRXJY21lQ

ssteele18
10-19-2012, 02:20 PM
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 (http://www.mobileinformationlabs.com/HowTo-1Woofer-Box-CAL%20Port%20lenth%201.htm)

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
10-19-2012, 02:23 PM
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
10-19-2012, 08:53 PM
Yeah I will be doing 2 ports at 9" long each. 4" diameter. Approx 37 HZ in a 4 cubed box.