Boss CH103DVC 10-Inch Subwoofer with Double Stacked Magnets Power Peak, 700 Watts; RMS Power, 350 Watts Cone Material, Metallic INJECTION; Magnet Structure, 100 oz Voice Coil Size, 1.5-Inch Efficiency 1 Watt/1 Meter, 94dB; Frequency Response, 35Hz-2.2kHz; Impedance, Dual 4 ohm Mounting Depth, 5-5/16-Inch