Definitive Technology BP7000SC 120v Tower Speaker (Single, Left Channel, Black) (Discontinued by Manufacturer) Left-channel bipolar supertower (the right-channel BP7000SC supertower is needed to make a pair) Equipped with four 6.5-inch high definition cast-magnesium basket polymer upper bass/midrange drivers Equipped with two 1-inch pure aluminum dome tweeters with silk surrounds Equipped with one 14-inch long-throw subwoofer coupled to two 14-inch infrasonic radiators Frequency response: 11Hz - 30kHz