RSX18A is an active subwoofer features an 18" low frequency woofer with a robust 3" voice coil driven by 2,000 watts of Class D power. It features balanced XLR stereo inputs, as well as both balanced XLR stereo full range and balanced XLR stereo high pass outputs to run your satellite speakers or daisy chain with additional subwoofers. The high pass output option allows you to focus the subwoofers power exclusively on the low frequencies.To ensure roadworthy durability, the RSX18A is constructed of solid 9-layer plywood and features a perforated steel grill. The enclosure also features two steel side carry handles, a 1 3/8" (35mm) pole mount receptacle and 3" casters.