Let me start over, since I realize all these free enclosure calculators are WAY off.
I will be running a 15" Fi Q on a 1200wrms in my trunk car, with sub facing UP and Port Backwards. I want 4.0 cubic feet after port and sub disp, tuned to 32hz w/ 65sq" of port.
I want the box to be 30" long and 14" high, my max width is 30" though.
Here is what I came up with so far, but I cannot figure out the second port length for the correct tuning.
External Dims: 24"w x 30"d x 14"h
Internal Dims (using .75" wood) : 22.5w x 28.5d x 12.5h
Internal Volume includ. port disp = 4.638
Port 1 = 5.25" w x 12.5" h x 24" d
Port 1 disp = 0.9 cu ft
Port 2 = 5.25" w x 12.5" x ?
And that is where I got stuck.
I need the depth and height to be the same, but the width can be changed around.
If you could help, that would be awesome!
Thanks man!