The VD series 10-inch dual 2 ohm shallow mount subwoofer by skar audio were designed to be a very versatile and powerful driver. When space or mounting depth is an issue, look no further. The vd-10 woofer is extremely powerful, rated at a conservative 500 watts RMS power, and feature a high quality 2" bass voice coil. Furthermore, the VD series utilize only the best parts, such as a competition grade cone, high strength foam surround, and a 2 layer convex spider for high power handling. These components in conjunction with the advanced cooling design of this woofer allow it to fit in much shallower enclosures, yet allow it to perform with attitude. RMS: power : 500 watts, max power , 800 watts, sensitivity: 84.7 Db, competition grade paper cone, foam surround material, 2-inch voice coil, resonance frequency: 35.2 Hz, mechanical q factor (QMS): 5.76, Electrical factor (QES): 0.49, Total q factor (QTS): 0.43, XMAX: 11.5Mm one-way, force factor: 20.6 N/a, magnet weight: 68 oz. 10-Inch Dual 2 ohm Shallow Mount Subwoofer Peak Power: 800 Watts | RMS Power: 500 Watts Shallow Mount Design - Mounting Depth: 4.41" High Performance Pressed Paper Cone Stitched to Premium Foam Surround Sensitivity: 85.2 dB | Fs: 42.0 Hz