Hifonics BRX12D4 Brutus Dual Subwoofer, 4-Ohm 450-Watt 12-Inch 12" Dual 4 Ohm Brutus Series Subwoofer Power Handling: Peak: 900 watts / RMS: 450 watts Impedance: Dual 4 Ohms Heavy duty woven texture polypropylene cone & injection molded dust cap UV Resistant butyl rubber surround