Samson Auro D1800 - 500 Watts 18-Inch Active Subwoofer Enclosure Solid 3/4-inch plywood construction with textured finish 500 watts RMS and 1000 watts peak of Class D power 18-inch low frequency transducer with robust 3-inch voice coil Fixed frequency (126 Hz, 24 dB/octave) electronic crossover, Balanced XLR stereo input