Boston Acoustics RS 244C Center Channel Speaker (Discontinued by Manufacturer) Quadruple 4-Inch (102mm) FCCM woofers produce smooth response and deep, tight bass 1-Inch (25mm) EWB (Extended Wide Bandwidth) tweeter delivers exceptional clear and detailed highs Elegant, scratch resistant high gloss piano black lacquer finish Magnetic grille minimizes acoustical interference for an improved soundstage Nominal 8-Ohm impedance and 89 dB sensitivity