Hey man!I built a subwoofer box for two 12's for my 06.Came out great!Gonna build a box for a 15" for my son,specs say 1.8-5.2 cuft sealed,so which is better the 1.8 or 5.2?Thanks!

 

That doesnt sound right that sub would have that much of a range. Normally that large of a box would be ported. Id say start on the smaller side and you can always add polyfill to make it act like a bigger box if need be.

 

well its from crutchfield,and thats what they have.
He emailed them and they said to go with the biggest if you got the room,which he does with a 98 ext cab ford of course.One 15,two 8's!