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Lower frequencies are harder to get greater SPL but to tune your box to 31 and peak at 41 is way off. I've never trusted any of those box programs. I've used them to make 3 test boxes and not once did they come out right when I tested them on Smarrt. Peaking that far off means the frequencies that you tuned your box to are being canceled out, from A. speakers being poorly spaced to your port (should cause it to be that far off though(note. if the box was firing into the trunk it would not matter because you turn your trunk into a 6th order bandpass)). B. Splitting the port cause air speed to exceed 10% the speed of sound and you're just getting port noise below 41hz.
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