well after sub displacement its 8.66cubic ft.
wanted it tuned to 30hz. minimum area for the slot port would be 100.55inches.
so i did 16.5in. by 7in giving me 115.5in. area.
so when using http://www.carstereo.com/help2/Articles.cfm?id=31
i put in 1 port and the rest of the info and it gives me 27.57in. in length.
But if i wanted to do 2 ports, lets say one on each side of the box towards the back couldnt i just do two ports at 16.5x3.5 at 13.78in. in length?
or am i doing that all wrong?