I was thinking of something similar, with the two subs inverted on either side of the box with a 12" aero port in the center at 30hz probably one from psycho port. Not sure how long it'd be. But having them inverted would cut down box displacement by about .5/1 cuft which isn't much but every bit helps.. I'd much rather have 2 15s simply due to cone area. But I'll need to run that 6k at .5 ohm which will be tough on... everything lolMy box right now is 40x26.25x17It's a bit small and pushed back a bit away from the back seats, but it's not too bad.
I'd like to try a few different boxes in there, but it's a lot of work having to tear the whole thing apart each time I wanna try something new.
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