could really use some help here

[SmokeyDog 10+ year member]

i am building a box for 4 cvr kicker 12 d2s. i need help with the port. right now the box is 39.5 wide 35.5 deep 15 high the port i came up with is

9x9x11deep my ? is, is 81 in2 enough space for 8.81 cf my total displacement is .96 box sould be tuned around 36hz. is this all correct?

subs up port up

and if i extend the port up to the rear deck and cut away the metal so theres no obstrutions would this be better then just staing flat with the box?

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[tinmanchris217 10+ year member]

If you gave external dimensions, subtract 1.5" from each dimension to find the box's volume. If you remove 0.96 cf of sub displacement and port volume (9x9x11+wood) ~ .6 cf... that leaves an internal volume of 5.6 cf.

According to a port calculator, an 11" port should tune to 46 Hz.

Check it all for yourself on The 12 Volt's Online Calculators

On a side note, you want around 15 sq in of port area per cubic foot of internal volume of the box. You have the right amount of port area: 81 vs 84