The CCM663 is a high-performance ceiling speaker. The tweeter features a 25mm (1in) aluminum dome, and its housing rotates for adjustable high-frequency response. The chassis of the bass/midrange driver is molded to provide additional rigidity, resulting in cleaner and faster bass, as well as a three-position EQ switch for better off-axis response. The blue Aramid fiber cone means the unit is well-hidden behind the grille, yet produces exceptionally clear and dynamic sound. It incorporates QuickDogs functionality and plug-and-play for quick and easy installation.