DESC: Golden Injected polypropylene Cone Non-Fatiguing Rubber Suspension Golden-Plated Steel Basket w/Golden Terminal Golden-Plated Backplate w/Bumped & Vented Structure 4-Layer High Temperature 2.5 Kapton Voice Coil Double Magnet Structure overall Diameter 12.20 4 Ohms Impedance SPL @ 1W/1M 89.8DB Frequency Response: 35Hz-3.5kHz Dual 60 Oz. Heavy Magnt Structure Mounting Depth 6.61 600 Watt RMS Power 1200 Watt Peak Power