Okay so i'm designing this box for 2 jl 12w6s and its going to be ~4-4.5 cubes @ 28-34 Hz.
then i come to the port area, so i go check JL's website and it says for 1 12, use two 2.5" aero ports 13.6" long. I calculate this out and it gives me like 10sq in of port and tuned to 28Hz
So now i'm wondering isn't that really low? i thought it was 12-16in of port area per cu.ft. The box JL suggests is 2.25 cubes @ 28Hz with 10sq in of port.
I believe 12-16sq^in of port face is for minimal port noise in a slot/rectangle port. I haven't used many aero ports but I know they don't require as much port face to reduce port noise.