The HFX12D4 subwoofer offers superior sonic accuracy, intense high power sound quality with exotic build materials and outstanding good looks. The Hifonics HFX12D4 12 inch car subwoofer features an 800 watt peak/400 watt Rms, high excursion rubber surround, large air cooled magnet assembly, high energy magnet and ultra ridged chrome stamped steel basket. This Dual Voice Coil 4 Ohm Subwoofer is an incredible value and includes a large air cooled magnet assembly. Large Air Cooled Magnet Assembly Injected Poly Light Rigid Cone 1 Year Manufacturer Warranty