Sound Storm Laboratories 10 Inch Single 4 Ohm Voice Coil 400 Watts Subwoofer (Fs10) peak power handling 400W magnet structure 40 Ounce efficiency 1W/1M 92dB frequency response 30Hz-2kHz mounting depth 4 Inches peak power handling 400W magnet structure 40 Oz. efficiency 1W/1M 92dB frequency response 30Hz-2kHz mounting depth 4"