Niles CM760DSC (Ea.) 7-Inch Ceiling Mount Center Channel Loudspeaker Fully Pivoting, Patented Woofer Assembly Focuses The Bass And Midrange Tones Directly Into The Listening Area (pivots Up To 20 degrees) 1-Inch Fluid-cooled Teteron(R) Dome Tweeter Offers Ultra-wide Dispersion And Silky-smooth High-frequency Response 2 Position Presence And 3 Position Tweeter Level Controls Provide For Precise Matching To Room Acoustics Proprietary Bridge-mounted Tweeter-adjustment Mechanism Focuses The High Frequency Sound In Any Direction Up To 20 degrees Without Diffraction Includes Flush-mount MicroPerf(TM) Aluminum Grille For A Clean And Unobtrusive Look