Planet Audio AC12D 12-Inch 3600W Subwoofers (Pair) MAX Power Handling: 1800 Watts (3600 Watt per Pair) RMS Power Handling: 900 Watts (1800 Watt per Pair) Frequency Response: 32Hz - 3kHz Efficiency (1 Watt/1 Meter): 88 dB Voice Coil Diameter: 2"