Definitive Technology ProCenter 2000 Compact Center Speaker - Single, Black (Certified Refurbished) This Certified Refurbished product is tested & certified to look and work likenew. The product includes all original accessories, and is backed by a 1 year warranty. Single ProCenter center-channel speaker equipped with two 5.25-inch cast basket drivers coupled to two 5.25-inch pressure-driven planar low-frequency radiators Nominal impedance: 4 to 8 ohms  Frequency response: 42 Hz to 30 kHz  Recommended amplification: 10 to 250 watts  Efficiency: 91 dB Driver complement: 2 x 5.25" bass/midrange drivers; 2 x 5.25" low-frequency radiators; 1 x 1" aluminum dome tweeter  Magnetic shielding: Yes Dimensions: 17 by 6.5 by 6.5 inches (W x H x D)  Finish: Gloss black