Polk Audio RM6880 5.1 Home Theater Speaker System (Set of Six, Black) 6-piece home theater speaker system with 4 satellite speakers, center channel speaker, and powered subwoofer Single center speaker uses two 3.5-inch midrange drivers and a 0.75 silk/polymer dome tweeter Satellite speakers use a 3.5-inch midrange driver and a 0.75 silk/polymer dome tweeter Powered subwoofer is equipped with a 10-inch driver and slot load bass vents Satellites are magnetically shielded for safe placement near other electronic systems