The X in MX Series stands for Xtreme. And these midrange speakers are the definition of Xtreme. Massive ferrite magnets, 3-plus inch high temperature voice coils, and soft parts designed for longevity, the MX Series is reserved for those looking to seriously upgrade their pro audio set up. Do you want to be the loudest vehicle on the streets? Do you want to drown out the other guy's stunt wall? If you answered YES then you need to go Xtreme.