2) Planet Audio 12" 1800W Subwoofers + Vented Lined Box Enclosure + Amp + Wire MAX Power Handling: 1800 Watts (3600 Watts Per Pair) RMS Power Handling: 900 Watts (1800 Watts Per Pair) Frequency Response: 32Hz 3kHz Efficiency (1 Watt/1 Meter): 88 dB Voice Coil Diameter: 2"