Port calculation help!

[SPL KID 10+ year member]

Ok I came up with a enclosure design. I wanna check with you guys to see if it's correct.

In a 6 cube box I want (4) 6 inch ports it says 20.7 inches for vent lenght but i'm not sure if that is per port or a divided total can sombodies help please.

This is for 4 10's in a common chamber. Or suggest what you may please. need advice immediately.

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[gsuchyta 10+ year member]

Each 6" port needs to be 20.7" long for a tuning of 45hz.

 

[gsuchyta 10+ year member]

it is not a divided total. So the total length of 6" port would be 82.8"

 

[gsuchyta 10+ year member]

I'm guessing you are going for spl with that much port are for 4 10's and that high of tuning

 

[SPL KID 10+ year member]

LOL did my S/N give that away?!?!?! //content.invisioncic.com/y282845/emoticons/hilarious.gif.02a037aad04aa96f19982b298a3d70a8.gif

 

[SPL KID 10+ year member]

ok 4 inches came out to be

4 diameter by 8.22 inches each

and i can seal off 2 ports to tune for street use. same with the 6 inchers.

which would be better?

 

[SPL KID 10+ year member]

I went with the 4 4 inches after seeing the 6 inch ports! also takes up less box space!