MOFO Type S subwoofers are refined and increase efficiency dramatically! MOFO Type S subs use a composite sandwich cone with a polypropylene surface for durability and Spruce pulp backing for smooth low bass. Like the original MOFOs, the new models still use an aluminum dust cap that couples to the voice coil former and extends over the cone. Why? The fins brace the cone and eliminate cone flex during high excursion. And since they are aluminum and couple to the voice coil, they act as a heatsink or heat extractor. Using the latest materials, the new MOFO subs yield superior performance. Cast aluminum baskets? Of course! Increased bottom octave output? You Bet! Louder than the original design? Duh!! MOFO Type S Subwoofer Features: Overcompensating Motor Structure for Increased Magnetic Strength12mm T-Yoke & Top Plate Improve Low-Frequency DynamicsVented T-Yoke & Frame Reduces Voice Coil Heat Build-upDie-Cast Aluminum Heat Sink Dust Cap Absorbs Voice Coil HeatAluminum Dust Cap Fins Dissipate Heat & Strengthen ConeNon-Magnetic Non-Resonate Die-Cast Aluminum Frame2.5” 4-Layer Voice Coil w/ Large Gauge Wire Increases PowerHigh-Temperature Tolerance Adhesives Resist Thermal FailureNickel Plated 8ga Spring-Loaded Compression Wire TerminalsNon-Transfer Spruce Pulp Cone w/ UV & Chemical ProtectionHigh-Density Polyether Foam Surround w/ UV & Chemical ProtectionDual Poly-Cotton Suspension Dampen Violent AccelerationsStitched Voice Coil Leads Prevent Potential Damage1-pc Gasket/Trim Ring w/ Concealed Mounting Holes Included