The PD Woofer Series is a series of High Power subwoofers equipped with a 100mm voice coil 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 many two-way speakers and bass reflex solutions. 4”(100mm) inside-outside copper voice coil  Ferrite Magnet Aluminium basket reduces magnetic interference Glass-fibre reinforced paper cone Nominal Impedance Of 8 Ohms Radial cone shape  Suitable for a wide variety of applications