The dB1800a is a self-powered subwoofer featuring a heavy-duty 18" low frequency driver with butyl surround, complemented by a 1000 Watt power amplifier. The dB1800a provides an active stereo crossover with high-passed output for running your satellite speakers. Constructed of solid 3/4 inch plywood, with steel corners, tough carpet covering and large casters. The sub-woofer features large metal grab handles and a 35mm pole mount receptacle. In fixed installation systems, the dB1800a provides super tight low frequency output in a relatively small, unobtrusive enclosure. Perfect for any sound reinforcement system where low-end is desired.