Originally Posted by sbarber82
I need 25 square inches. I have five inches to the motors inside the box and 7 " outside the box for port length.
No offense, but you clearly don't understand how these things work.
You can't decide your tuning frequency AND port area AND port length! You have nothing left to "vary" since you've already fixed all the variables! Unless you are God, you cannot make a 1 ft³ box with 25 in² of port area and 12" of port length resonate at 50Hz. Im-fuggin-possible.
One or more things HAVE to give. So once and for all, decide which things are to give.