Definitive Technology ProSub 1000 300 watt 10 In. Subwoofer (Certified Refurbished) This Certified Refurbished product is tested & certified to look and work like-new. The product includes all original accessories, and is backed by a 1 year warranty. Single ProSub powered subwoofer speaker - Equipped with one high-definition 10-inch woofer with polymer cone coupled to one 10-inch infrasonic radiator. Built in 300 watts RMS amplifier. Frequency response: 18Hz - 150Hz High quality finish in matte black.