Boss D120FD Diablo 12" Low Profile Poly Injection Cone Dual Voice Coil Subwoofer Power Peak, 1000 Watts; RMS Power, 500 Watts Cone Material, POLY INJECTION Voice Coil Size & Type, 2-Inch; Efficiency 1 Watt/1 Meter, 95 dB Frequency Response, 28Hz  2kHz; Impedance, dual 4 ohm Mounting Depth, 3-7/8-Inch