CELESTION FTR184080FD FTR Series 18-Inch 1000-Watt Subwoofer<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Nominal diameter 457 mm/18 in Power rating 11000W rms Nominal impedance 8 Sensitivity 297 dB </span></li><li><span class="a-list-item"> Frequency range 30-2500 Hz Voice coil diameter 100 mm/4 in Chassis typecast Aluminum Magnet type Ferrite </span></li><li><span class="a-list-item"> Magnet weight 3.1 kg/110 oz. Coil material Round copper Former material Glass Fibercon material Glass loaded paper with weather-resistant impregnation </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41N5bZZhC4L.jpg" noproxy>