SSW-15A-2A:250W+2x150W/3 AMP 15 inch Active Subwoofer, plastic cabinet, woofer:4inch voice coil,100OZ,RMS600W

SSW-18A-2A:600Watts ,18inch Active Subwoofer, plastic speaker, woofer:4inch voice coil,100OZ,RMS800W

SSW-15A-2:600Watts, passive 15inch plastic subwoofer, woofer:4inch voice coil,100OZ,RMS600W

SSW-18A-2:800Watts, Passive 18inch plastic subwoofer, woofer:4inch voice coil,100OZ,RMS800W