Polk Audio CS245i Center Channel Speaker for Home Theater (Discontinued by Manufacturer) Two 5-1/4 Diameter Woofer / Midrange drivers and one 1 Dome Tweeter work together to deliver outstanding sound from deep lows to definitive highs Amazingly wide 52 Hz to 26,000Hz frequency-response Recommended Amplifier Power - 10 -180 watts per channel Impedance - 8 Ohms Magnetically shielded