Athena Technologies AS-F2 Dual 8" 2-Way Floorstanding Speaker (Single) Single floorstanding 2-way speaker (use 2 for stereo, 4 or more for surround sound) 1-inch Teteron dome tweeter and dual 8-inch injection-molded composite polypropylene woofers with rubber surrounds 35 to 20,000 Hz frequency response (+/-3 dB); 93 dB efficiency Rated for use with amplifiers providing up to 250 watts per channel Measures 9.5 x 41.5 x 15 inches (W x H x D)