Polk Audio CSI A4-Black High Performance Center Speaker Single Part Number: CSi A4 Type: Center Channel Speaker Speakers Configuration: Center Driver Units: Midrange: 2 - 5.25 Diameter, Polymer Composite Dynamic Balance with rubber surround Tweeter: 1 - 1 Diameter, Silk Polymer Dome Tweeter Power Rating: 20-180 w/channel Frequency Response: 55Hz-27kHz Nominal Impedance: 8 ohms Sensitivity: 89 dB
