Fair enough. This is a sub I have looked at to combine in a PA scenario with the 15″ B&C I’d like to get at some point.
Unfortunately, you can get loud or you can get low, but rarely both. The F3 I have for the design on the Kraken is 40.4Hz with a 3 cu. ft. enclosure (small considering the size of the driver), a 24″ slot port with 2.25″ height, split down the middle (so two ports in reality and what I entered into WinISD) giving 24.45″ length on the port. First port res. of 276.72Hz. The filters I put on are LR at 31.2Hz Highpass and Lowpass LR at 80Hz. That would get you a peak of 123dB@2000W.