Definitive Technology ProCinema 600 5.1 Home Theater Speaker System (black) Single ProCenter center-channel speaker;Impedance : 8 ohms Equipped with two 3.25-inch bass/midrange drivers coupled to two 3.25-inch pressure-driven planar low-frequency radiator Frequency response: 55Hz - 30kHz Equipped with one 1-inch pure aluminum dome tweeter The high quality finish is available in gloss black or gloss white