6-1/2 inch 2-way in-ceiling enclosed speaker system features a plastic enclosure backbox, which acts as a protectorate from dust, dirt, and other construction debris, and aids in the projection of sound into a room. EZ mounting tabs facilitate installation. It has a 6 1/2 inch polypropylene cone woofer and a mylar tweeter. It features a 35 watt RMS with a 100 watt maximum and a sensitivity of 90 dB. It offers a frequency range of 65 to 20,000 Hz.