For those who love to have deep understanding of our unique DMF digital motional feedback subwoofer, we offer no less than six white papers by its designer Rob Munnig Schmidt: about how loudspeakers work; about sources of distortion in loudspeaker driver design; about why to avoid bassreflex designs; about acceleration based motional feedback subwoofers; about velocity feedback and why that does not solve the problem; and about how to realize an acceleration feedback subwoofer. Mark that math is not avoided, but no one can present those formulas so clearly like Rob.