Port Length Calculator question....

[mebcop 10+ year member]

I'm trying to calculate my port length need for my box....

When I use the port length calculator, I am entering that I need two 4" ports, in a 2.4ft3 box tuned to like 35 Hz, and it tells me I need a port length of 20.11".....

Do they mean I need two 4" ports that are 20.11" EACH or two 4" ports that total a length of 20.11" (10.55" each)?????

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[krainium 10+ year member]

20.11" each

 

[dappa5 10+ year member]

you are gonna have to tune that box higher like 48- 50 hz or build it with 1/2 internal 1/2 external ports