Alto Professional Truesonic SUB15 | 15" Active Subwoofer (1200W Peak / 600W Continuous / Class D Power) Extended low frequency, long-excursion 15" woofer Explosive 1200W power provided by Class D switch mode power supply 18mm birch plywood vented cabinet with metal grille and recessed handles 120Hz Crossover Dual XLR inputs and outputs for mono and stereo applications