25cm (10") Dual Subwoofer from the Vector Serie 475W RMS 950W MAX Impedancy: Dual 4 Ohm Frequency response: 12Hz - 250Hz 120oz. Magnet Efficiency: 92dB @ 1w/1m Dual 64mm Alu Voice Coil Alubasket Dual Composite Paper Cone Depth: 133mm