The W990 features Revels low-distortion motor structure designs with aluminum tweeters and Micro Ceramic Composite (MCC) cone woofers for true audiophilegrade performance and easy timbre-matching to Revel floorstanding, monitor and center channel loudspeakers.Installation is quick and easy with a patented installation mechanism that doesnt require any tools for clamping to the drywall and accommodates a wide variety of wall thicknesses and construction types.For the finishing touch, frameless grilles attach magnetically giving the loudspeaker an elegant, yet unobtrusive look. All eleven in-wall loudspeaker models include square grilles to provide a perfect match for existing wall fixtures and lighting.With this new in-wall loudspeaker product line, there is a loudspeaker to suit any application from background audio to high-end multichannel home theater installations proving once again that Revel builds the Worlds Finest Loudspeakers.Long-throw woofers with cast aluminum frames, MCC (Micro Ceramic Composite) cones and rubber surrounds provide high output with low distortion. 1-inch (25mm) aluminum-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 lets you adjust the speaker to maintain tonal accuracy when the speaker is placed near an additional wall or the ceiling. Three-position tweeter level control lets you adjust for optimum response in a variety of acoustical environments, or for using the speakers without grilles. High-frequency tilt and listener axis controls help compensate for less-than-ideal speaker placement.