Mission m30i 2-Way Bookshelf Speakers, Pair (Graphite Black) (Discontinued by Manufacturer) Pair of wall-mountable 2-way bookshelf speakers for stereo or surround sound use 3.93-inch DiaDrive woofers combine best attributes of soft fiber and high-rigidity cones 1-inch Viotex fabric dome tweeters ensure excellent dynamic range; 2.5 kHz crossover frequency 68 Hz to 20 kHz frequency response; 15- to 75-watt recommended amp power Sleek graphite black finish; 5.7 by 8.6 by 7.5 inches (W x H x D) each; 1-year warranty