I asked for help on my last box but i can't get it to fit in my trunk so now i have a new box and i need help with the port size.

the box INTERNALLY measures: 14.875 W x 12.5 H x 14.5 D

it is a box for a single 12... can some one help me with the port size?

I want it to be tuned to 30 hertz the internal volume is:

1.5602394386574074074074074074074 cu ft

the port face is 14.875 x 3

TIA

I know the formula.. i just can't seem to get the right answer.

Lv = Av*1.84*10^8/[Vb*1728*(Fb/0.159)^2] - 0.823*sqrt(Av)

Lv is port length (what your solving for)

Av is your port area (height x width of the port face)

Vb is the internal volume of your box

Fb is the tuning frequency you want

subtract half of your port width from your port length(Lv) to get physical Lv

help plz

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