I have no experience with thiele small, and I don't have any parameters for the speaker I have. I only know the xmax, which is about 1cm p-p. it's an 8" speaker, which gives me this: suface area= ~50.25 sq in., displacement= ~19.78 cu in., and the cab has a volume of about 1440 cu in.. Knowing this information, how do I calculate the resonant frequency at xmax? I haven't been able to find info on google because a) every equation uses data I don't have or can't get since I don't have the equipment to measure the speaker, and b) the ones that might work use constants that I can't calculate since I don't know the required parameters... There has to be a way to calculate resonance with just volume and displacement, right? Or is there more black magic involved than I thought?