Memphis Audio 15" 1 Ohm or 2 Ohm Selectable Subwoofer  Memphis Audio created the M7 Series M71512 15" subwoofer for high-performance bass reproduction. The polypropylene cone has the stiffness to maintain high levels of accuracy, while its double-stitched rubber surround helps to maximize and control excursion. The vented cast-aluminum basket keeps things cool, and virtually eliminates resonances that can color your bass. The triple 2.5" aluminum voice coils combine with a 120-ounce magnet gives this subwoofer the ability to handle up to 750 watts RMS and reach 1500 watts max power. Easy-to-use color-coded jumpers allow you to wire the sub for 1 or 2 ohms for system flexibility, great news if you have a high-performance mono sub amp. Features 750W RMS/ 1500W Max Sensitivity - 86.1dB @ 1 Ohm/ 86.8dB @ 2 Ohm Magnet Size - 120 Oz Mounting Depth - 8.39in Cut Out Diameter - 14.06in 1 Ohm or 2 Ohm selectable impedance 2.5" aluminum triple voice coil  Vented cast aluminum basket Double-stitched rubber surround DVVC Direct vent voice coil cooling 120oz magnet Lightweight polypropylene dust cap Reinforced spider Folded Surround for increased excursion without sacrificing effective surface area