High-End In ceiling speaker Simple mounting with special mechanism Twin tweeter with 19mm aluminium dome and high power Neodym magnet Special tweeter alignement for best sound Multi-Directivity circuit to optimize the speaker to the room Woofer and midrange with carbon fibre cone and phase plug Massive speaker terminal High quality crossover with APOCHigh quality crossover with APOC High quality crossover with APOCHigh quality crossover with APOC