The PDNW Woofer Series is a series of High Power subwoofers equipped with a 100mm voice coil, a double silicon spider and a die-cast aluminium basket that reduces magnetic interference. These woofers are ideal for use in applications where incredible power handling, long excursion and perfect control is required. Suitable for the most subwoofer cabinets; both bass-reflex and band-pass. 4”(100mm) inside-outside copper voice coil  Neodymium Magnet Double spider construction with silicone-based dampening Aluminium basket reduces magnetic interference Glass-fibre loaded waterproof cone Nominal Impedance Of 8 Ohms Radial cone shape  Suitable for the most subwoofer cabinets