If you measure it, you'll find it resonates around 40Hz to 42Hz, somewhere in there. I've seen some Helmholtz calculators that show values a little higher, some a little lower. Mostly I think it's the difference in the area offset, sometimes called "corrected length". If you try two or three different calculators, you'll see what I mean.The tower two π is a little trickier than some bass reflex cabinets in that standing waves are developed within the passband. That makes port and driver location pretty important. It also makes the insulation even more important than usual, so be sure to install it as described in the plans.
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