Advent AV570 70-Watt 2-Way Powered Multimedia Speaker System (Pair) (Discontinued by Manufacturer) Pair of powered multimedia speakers with 35-watt built-in amplifiers 5-inch polypropylene woofers and 1-inch fluid-filled polycarbonate tweeters 40 to 25,000 Hz frequency response; AC power or DC battery operation Individual bass and treble controls and auto on/off power operation Each speaker measures 6.5 x 10.5 x 7.6 inches (W x H x D) and weighs 9.92 pounds