need help with my box. please help!!!!!!

[kendall64 0]

so i have just bought 4 ppi pcx 12'' subs and i need help building a box but im not good at all with knowing how big or long to make my port. i have a two door tahoe and i have plenty of space height 22'' width 46'' and length 37''.

here are the specs

each sub needs 1.25 cubic feet so 5 cubic feet all together. speaker displacement incuded is already included

port diameter 2.6'' (inside) per sub

port length 12'' per sub

Equivalent Square Port 2.3x2.3 per sub

if anyone could help that would be awesome i would also they the box to be around 30 hz's too

[kendall64 0]

thanks for the help....not

[Sir-Lancelot 216]

lol

[joe_prince 4]