Polk Audio CSI A6-Black High Performance Center Speaker Single, Dual 6.5 inch Drivers and a 1-inch dome tweeter Part Number: Csi_A6_Black Type: Center Channel Speaker Speakers Configuration: Center Channel Driver Units: Mid/Woofer: 2 - 6.5 Diameter, Polymer Composite Dynamic Balance with rubber surround Tweeter: 1 - 1 Diameter, Silk Polymer Dome Tweeter Frequency Response: 45Hz-27kHz Nominal Impedance: 8 ohms Sensitivity: 90 dB Connectors: Inputs: 5-way binding posts