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Designed my ported box in TermLab. Calculation and measurement while I built the box is telling me I'm tuned to 33Hz. Used an IM-SG to confirm box tuning is actually 26Hz. Perceptively, I thought 33Hz really was the tuning frequency, but I was mistaking it for the onset of cabin gain (Starting around 32Hz and dropping around 48Hz). Lesson learned: calculations are approximations, and tuning frequency of a box is hard to discern by ear once its in the car. Max port velocity and minimum excursion is what I should have been paying more attention to.