Our 8 inch two-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 installations. It has a 8 inch polypropylene cone woofer and a pivoting 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 50 to 20,000 Hz. Alternatively, it is also available in 6 inch (SP-6ECS) version.