ok so im helping a buddy of mine build a sub box for his truck

its a regular cab F-150

the sub is a 12" TE model treo sub

it has for ported specs from their website:

1.6 cu ft net ,16sq in vent, 18.5 in long, F3=31HZ

so i design a wedge box with the dimensions of : Height = 13.5" , width= 40.25" , upper depth = 7" , lower depth = 8.5"

he wants it tune to 31Hz

so i came up with these dimension for the ports:

two 2" ports on each end about 5 in long

know i really not sure if this is right or not was wondering if someone could give me there opinion.

i dont have a box building program so i did this all my hand just some math work.

thanks for your time!

Double check your math with this link.... PORT Size Calculations and Formulas for WOOFER and Subwoofer BOXES

well thats the same measurements i got ,

but i guess i was more talking about compared to the specs the treo website gives out .

im just wondering if the setup looks accurate or do i need to make some adjustments ?

so... anyone ? any suggestions ? or am i ok with these numbers?