2) Hifonics BRZ15D4 Brutus 15" 2400 Watt DVC 4-Ohm Car Audio Power Subwoofers HiFonics Brutus BRZ15D4 15" Car Audio Subwoofer Peak Power Handling : 1200 watts RMS Power Handling : 600 watts Dual 4-Ohm Voice Coil Impedance Final Impedance: can be used in 2 or 8 ohm configurations