The CCM663 is a true high performance ceiling-mount speaker. The tweeter has a 25mm (1in) aluminum dome and its housing pivots for adjustable off-axis treble response. The bass/midrange driver's die-cast chassis provides extra rigidity which results in a cleaner, faster bass, and a three-position EQ switch for a better off-axis response. The blue Aramid Fiber cone means that the unit is well hidden behind the grille but still produces a remarkably clear and dynamic sound. Incorporating QuickDogs™ and plug-and-play functionality it is quick and easy to install.