Bowers & Wilkins CCM663 is a true high performance in-ceiling speaker. The tweeter has a 25mm aluminium dome and its housing pivots for adjustable off axis treble response. The bass midrange driver’s diecast 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 Kevlar 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.