2) PLANET AUDIO AC12D 12" 3600W Car Subwoofers Subs+2600W 2 Channel Amplifier MAX Power Handling: 1800 Watts (3600 Watt per Pair) RMS Power Handling: 900 Watts (1800 Watt per Pair) Frequency Response: 23Hz - 3kHz Efficiency (1 Watt/1 Meter): 96 dB Voice Coil Diameter: 2"