Definitive Technology BP7006 120v Tower Speaker (Single, Right Channel, Black) (Discontinued by Manufacturer) Right-channel bipolar supertower (the left-channel BP7006 supertower is needed to make a pair) Equipped with two 4.5-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 8-inch long-throw subwoofer coupled to two 8-inch infrasonic radiators Frequency response: 17Hz - 30kHz