The New Massive Audio VOLT Series subwoofer uses a custom designed stamp steel basket with a heavy powder coat finish that surrounds a custom tooled poly mica cone and a Massive logo embossed in an ultra-low mass woven glass fiber dust cap. In the center of the cone is the 1.5? Dual 4 Ohm voice coil with aluminum former and reinforced neck joint. It is attached to the steel frame with a pro audio 1? N-Roll polyester foam surround. The Poly-Cotton spider with woven round tinsel lead wire holds the V.C. in place and helps deliver the CEA 2031 rated 600 Max Watts/300 Watts RMS power. All this helps the 4 layer V.C. pound its way thought a single 50oz high intensity grade ferrite ring with a FEMM linear flux saturated motor design which helps control motion and reduces distortion. This combination and black E-coated magnetic plates help draw heat away from V.C. and produces volumes of kick ass bass!