Is xmax directly related to port area?

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?

 
Not to thread jack, but I think I might have this problem. I got an mt 15, and the port is less than 5" deep port area is 12". Is this kind of like what he is saying? Would this cause a problem?

 
try like 80-100 of port and see what sounds like...and no, its not that easy to just change the port on an already constructed box
//content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif Time to sell it to a hood rat for 100

 
Yes a longer port yields lower tuning resulting in flatter response, but the ultimate unanswered question is when you have a sub, and know the paramaters, what the FU*ck do you do for port area?

 
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