how are you orienting the port/subs?
they fit with ease all facing up and port back. leaving about 12.5in from the back face and 14 front mounting location (on the outside). each sub was 1in from the sides (if measured to the gasket) and spaced at .5in apart long ways (58in) and .75 short ways (46in). this was with the full dimensions you posted.
i know how aeros work, i know they are more effiecient.
aero > PVC non flared > slot (in most cases).
edit: if you did full 18in tall and subs facing up, you would have about 10.5in between mags and the bottom to fit aeros through.
and you are right, they need to be ~22 or 23 long with the flare, i rechecked and had a miscalc.
with 1.5 all around you have the 20.5, the sub disp is 2.4, so 18.1, then 5 ports take up about 2 cubes, so you sit at 16.1, and 30hz with the ports being 22/23in long. WINNING!
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