New Pair of Hifonics HFX12D4 12 1600 Watt Car Subwoofers. 800 Watt Max (1600 Watt Pair).400 Watt RMS (800 Watt Pair). DVC 4 Ohm High Temp KSV Voice Coils. 1 NBR Reinforced Rubber Surround. The Hifonic HFX12D4 12 car subwoofer features a 800 watt peak/400 watt Rms each sub, high excursion rubber surround, large air cooled magnet assembly, high energy magnet and ultra ridged chrome stamped steel basket.