Polk Audio RM20 5.1 Home Theater Speaker System (Set of Five, Black) 5-piece home theater speaker system with 4 satellite speakers and a center channel speaker Equipped with dual 3.25-inch polymer composite midrange drivers and 0.75-inch silk/polymer composite dome tweeter per satellite Frequency response: 95Hz - 20kHz Center speaker includes dual 3.25-inch midrange drivers and single tweeter, 10-inch polymer composite subwoofer driver Satellites are magnetically shielded for safe placement near your TV