Alto Professional Black, 18 Inch (Black18S) Active Subwoofer with 18" long excursion, low-frequency transducer 1200 Watts (Continuous) of precision and projection with power to spare; 2400 Watts (Peak) Stereo Ins: Left = mic/line; Right = XLR. Stereo XLR Outputs Efficient Class D power amp Direct DSP access via onboard controls and Live Drive app High-performance internal crossover Designed and tuned in the USA