15-PRX12D4 - Memphis 12" 250W RMS 500W Max Dual 4-Ohm Power Reference Subwoofer Impedance (Ohms): 2 (Dual 4 Ohm) | Resonant Frequency (Hz): 35 Sensitivity @ 1W/1M (db): 86.75 | Voice Coil Diameter (in): 2 | Motor Strength (T/M): 8.84 Magnet Weight (oz): 60 | Recommended RMS Power (Watts): 250 | Maximum Peak Power (Watts): 500 Cut-Out Diameter (in): 11 Frame Diameter (in): 12.56 Mounting Depth (in): 5.54 Improved suspension and coil design | Reinforced spider shoulder