I have come to the conclusion from all my building expirience that when I have a low xmax sub they seem to like alot less port area than the high xmax ones. So hence would my proposed theory of using xmax in mm * .75 for inches of port area per cubic foot be a good starting point for my future builds? Thanks jw what some guys who really know the effect and requirments of port area are.
Ex: An FI SSD 15. 21mm xmax, 4ft @ 34hz = 63 in port area
ehqs12 9mm xmax, 2.5ft @ 33hz = 17in port area
I dont really know about this it doesnt seem to work out too well, but then what about a speaker really determines how much port area you should give it?