Cadence S4W18-D1 18" Competition Subwoofer Specifications RMS Power Handling: 3000 Watts PEAK Power Handling: 10.000 Watts Frequency Response: 25Hz - 500Hz SPL @ 1w/1m: 95dB System Impedance: DVC 1-Ohm Cutout Diameter: 16,5" / 42cm Mounting Depth: 9,88" / 25cm Features • Ultra Stiff Complex Fiber Glass Spun Material Cone • High Density Laminated Stiched Foam Surround • Cast Aluminum Basket with Composite Strength Design • Quad Spider Suspension System with Flex-Back Technology and Dual Elevation Platforms for Excursion Control • Double Thick Washer Plate with Energy Concentrating Angles • Magnet Motor Heatsink with Heat Pump Cooling Technology and Peripheral Multivent System • Ultra Sateratured High "BL" Magnetic Motor Gap • Extended Pole Piece Technology • 10 Gauge Direct Connect Speaker Wire Connection • 4" Super High Power 4 Layer Flat Wire Dual Voice Coil - Made in the USA