JBL GT5-10D 10-Inch Dual-Voice-Coil Subwoofer 10" Dual 4 Ohm GT5 Series Subwoofer Power Handling: Peak: 1000 watts / RMS: 275 watts Recommended power range: 150 - 275 watts RMS Impedance: 4 Ohms Polypropylene woofer cone material / Rubber-coated tinsel leads help to protect the leads against wear and harsh use 10" Dual-Voice-Coil Subwoofer Polypropylene woofer cone Proprietary steel frame Impedance: 2 or 8 ohms Power handling, Peak: 1100W