ButtKicker BK-LFE Low Frequency Effects System Offers true infrasonic, or low-frequency response with a resonant frequency of 9 Hz Attaches to seats and floors, and sends low-frequency sound directly into the listener's body Accurately reproduce the feeling range of many natural and man-made sounds Power handling ranges from a minimum of 400 watts to a 1,500-watt maximum Measures 5.375 x 5.5 x 5.375 inches (WxHxD), and weighs 11 pounds