2) Planet Audio AC12D 12" 3600W Subs + GMC Chevy Silverado Ext Cab '99-06 Box 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"