Designing a port

[David]

OK so I need to be edumacated on Porting

example

13.8^3 common chamber  for 2 15's before displacement

deminsions are 40 x 40 x15

what are the rules of porting?

how big is to big?   what is too small?

I have learned that for a burp box Port area is key.

example= a Friend says 300^2 would work well for my design if it was a Burp only box.

or 100 to 150^2 for music  and I want to port it for music for now because I will be driving it daily for a while.

so  Edumacate please  lets hear some of your theories 

D