Venting

[Mr_T 10+ year member]

ok I have a 5^ft box and it is vented to 45hz,

I need to retune this box to 30.

here are the l,w,h of the vent,

13 long,

6.5 wide,

11.25 high.

how long would I have make the length to tune it to 30hz if I kept the H,W the same?

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