MS-12SD4 A 12"" (300mm), high power-handling, dual voice-coil premium subwoofer
Peak: 1800 watts, RMS: 900 watts, Impedance: Dual 4 ohms, Polypropylene cone material, Laminated polyurethane and fabric surround, Vented pole piece, 2-‚½" Copper voice coil with Kapton former