Ported box -
Recommended Volume (Cubic feet) - 2.0
F3(Hz) - 35
Number of Ports - 1
Port diameter(Inches) - 4
Port Length(Inches) - 10.75
thats what rockford suggests..but i know people can build them were they sound really good and what not..and well if im going to have to pay ya know...like 80 online why not get a better sounding box from someone...who can build it perfect were the subs will get really loud with my brutus let me know....
if you can build me a box for my 4 door ford escort...