Pioneer TS-A300D4 12″ Dual 4-Ohm Subwoofer Power Handling: Peak: 1500 watts RMS: 500 watts Impedance: 4Ω Dual Voice Coil (DVC) Frequency Range: 20 Hz – 2.3 kHz SPL: 77dB Glass fiber and mica interlaced Injection Molded Polypropylene (IMPP) cone construction Butyl rubber surround Stamped Steel Basket Oversized 60 oz double stacked magnet and vented pole yoke for increased power handling.