The Bowers & Wilkins BB CCM8.5 In-Wall Speaker Back Box is designed specifically for the CCM8.5 In-Ceiling Speaker. Made of wood and in a sleek black color, this rectangular back box is compatible with Bowers & Wilkins speakers and features high-end audio with DTS, Dolby Atmos, and Dolby Digital surround sound formats. With a driver size of 8 inches and an impedance of 8 Ohms, this in-wall speaker offers a powerful RMS power of 200W, delivering an immersive sound experience for your home audio system.