1. ## did i do this right

my box is 9.05 cf
and want it tune to 30 hzs
so would the port be 5*12*12 inches?

2. ## Re: did i do this right

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.

thanks dude

4. ## Re: did i do this right

Originally Posted by Trixter
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

5. ## Re: did i do this right

Originally Posted by jmanpc
its 128 sq. in. of port
Actually...5 x 12 = 60 in^2

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

6. ## Re: did i do this right

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.

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