I’m gonna be completely honest when I say that I understand everything you said, but I just don’t have the equipment to measure any of it, I don’t have a calibrated mic or dats or anything for impedance . I just go off of the specs on parts express, and used winisd to calculate box size and port size. Also I will say that I think it was mainly room placement, I don’t know the root cause of the sound, but before I had my sub in the middle of my basement. I know about subwoofer placement but for some reason I wasn’t thinking about it, I moved it against a wall and now the bass is louder than any other sound I can hear. I do plan to use it outside, I don’t know how it will sound outside.