Im looking to wall off the back of my car and put a 4th order with 2 Obsidian Audio 18's. I am planning on doing 9 cubic feet sealed and around 22.5 cubic feet ported. this will give me a 2.5:1 ratio. << is that good?
I have been looking around at some 4th order programs and im just not sure what to believe. I know that I need to find the resonant frequency of the sealed part and tune the port to that frequency but im not exactly sure how to find that.
If anyone can help or chime in it would be greatly appreciated. Thanks