- Aug 27, 2001
I have a 3.9^3 ft box and I've just received my Shiva and a 4" port. I always see people saying that they tuned their port at 18Hz or 16Hz, etc, how do you do that? And my port is like 15" long(not counting the flare parts), should I cut it shorter? How much room should the port have inside the sub away from the inner wall?