This is a replacement Woofer intended for Memphis loaded enclosures. This woofer does not have spring terminals, selectable impedance, or a rubber magnet boot like the retail versions of these woofers. Replacement woofer for the Memphis Audio Dual 12 inch M7 Loaded Subwoofer Enclosure, 1500 Watts RMS SUBWOOFER FEATURES 2.5” aluminum voice coil Vented cast aluminum basket Double stitched rubber surround DVVC Direct Vent Voice Coil Cooling 120oz magnet Light weight Polypropylene dustcap Reinforced spider Folded surround for increased excursion without sacrificing effective surface area RMS/PEAK POWER: 750 Watts per subwoofer SENSITIVITY: 85.3