Polk Audio CS10 Black Center Speaker Single Part Number: CS10Blk Type: Center Channel Speaker Speakers Configuration: Home Theater Systems Driver Units: Mid/Woofer: 2 - 5.25 Diameter (13.34cm), Bi-Laminate Organic Fiber cone Tweeter: 1 - 1 Diameter (2.54cm), Silk Dome Dynamic Balance Power Rating: 20-125 w/channel Frequency Response: 53-25KHz Nominal Impedance: 8 ohms Sensitivity: 91 dB