The CCM663 is a true high performance ceiling speaker. The tweeter features a 25mm aluminum dome and its enclosure rotates off-axis for adjustable treble response. The bass / midrange driver's die-cast chassis provides added rigidity, resulting in cleaner, faster bass and a three-position EQ switch for better off-axis response. The aramid fiber cone means the unit is well hidden behind the grille, yet produces remarkably clear and dynamic sound. QuickDogs integration and plug-and-play features make installation quick and easy.