Revel in-ceiling loudspeakers draw upon the same research; resources; and unique perspectives that put all our loudspeakers in a class by themselves. Each model offers a standard-setting low sonic coloration and freedom from distortion over a wide dynamic range. Key Features: - Long-throw woofers with cast frames and rubber surrounds provide high output with low distortion. - 1-inch (25mm) angle-adjustable; metal-dome tweeter with an integrated waveguide provides optimized response both on and off axis. - High-order crossover network with premium-quality components delivers extraordinarily accurate timbre reproduction. - Boundary compensation switch (C783/C763) lets you adjust the speaker to maintain tonal accuracy when the speaker is placed near a wall. - Three-position tweeter level control (C783/C763/C583/C563) lets you adjust for optimum response in a variety of acoustical environments; or for using the speakers without grilles. What's in the box: - 8 in Internal In Ceiling Speaker