Mission m31i 2-Way Bookshelf Speakers, Pair (Graphite Black) (Discontinued by Manufacturer) Pair of stylish 2-way bookshelf loudspeakers for stereo or surround sound use 5.12-inch DiaDrive woofers combine best attributes of soft fiber and high-rigidity cones 1-inch Viotex fabric dome tweeters ensure excellent dynamic range; 2.8 kHz crossover frequency 65 Hz to 20 kHz frequency response; 25- to 75-watt recommended amp power Sleek graphite black finish; 6.7 by 10 by 11 inches (W x H x D) each; 1-year warranty