question on box tuning and RE box builder

[hazardous0388 10+ year member]

No im trying to tune a box for a fully loaded btl 15, lookin at 4.5 cu ft after displacements @ 45-48 hz, mainly for SPL. now im having a problem with the RE Box builder. Im attempting to build a box with these specs:::

Width 33

Height 17.5

Depth 21.5

i want the port width to be 5 inches, yet it wont let me change the port length 1, or how long the port goes in, thus keeping the tuning low. Is there a way that someone could give me a certain amount of port area for this sub to be tuned at 45 hz? Thanks

Dustin

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[SHiZNiLTi 10+ year member]

Do all the cuts as they have listed, but when making the cut for the port make it 13.5" x 16" instead of 15.75" x 16" and that will get you close to the 45-48hz tuning that your looking for.