Cadence Acoustics S1-Series S1W10-D2, 10� 700 Watt 2 Ohm DVC Subwoofer Series: S1 Series Type: Subwoofers Cone Material: Fiber Reinforced Ultra-Stiff Paper Composite Cone Surround Material: “M� Style Double Laminated Foam Surround for High Speed Bass Response Voice Coil: Dual Voice Coil Construction: Black Aluminum 4 Layer Voice Coil Damper (Spider): Quad Layer Linear Progressive Conex Spider Magnet Construction: Ultra Saturated, High “BL� Magnetic Motor Gap