25cm (10") Dual Subwoofer from the Pro Serie 300W RMS 400W MAX Imepdancy: Dual 6 Ohm Frequency response: 20Hz - 500Hz 100oz. Magnet Efficiency: 90dB @ 1w/1m Dual 51mm Alu Voice Coil Steelbasket UFO Style Polypropylen Cone Depth: 140mm