did i do this right

[Roddy_T 10+ year member]

my box is 9.05 cf

and want it tune to 30 hzs

so would the port be 5*12*12 inches?

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[Trixter 10+ year member]

for 9.05cu' tuned to 30hz and using 60sq" of port i come up with a length of 13.5...if you need to add an end correction factor (port and box share a common wall) then add 1/2 the port width to the length to get a new length of 16.5" long.

 

[Roddy_T 10+ year member]

thanks dude

 

[jmanpc 5,000+ posts]

for 9.05cu' tuned to 30hz and using 60sq" of port i come up with a length of 13.5...if you need to add an end correction factor (port and box share a common wall) then add 1/2 the port width to the length to get a new length of 16.5" long.

its 128 sq. in. of port //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

 

[TheOtherSide 10+ year member]

its 128 sq. in. of port //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

Actually...5 x 12 = 60 in^2

I think he initially calculated the port to be 12" in length, not 12" x 12".

 

[Immacomputer 10+ year member]

Your port should be just fine as long as the 9 cubic feet is after the port displacement. You need 13.35 inches of port length and you have 14.5 so it's tuned right around 29hz.