MTX Audio T812-44 T8000 Series Subwoofer Spider Plateau Venting Mechanically Targets Cooler Air at the Voice Coil Asymmetrical Linear Drive System Utilizes an Extended Pole Piece and Progressive Spider to Ensure Linear Motion Cast Aluminum Basket Reduces Resonance and Distortion Glass Fiber Cone Has Optimum Stiffness-to-Weight Ratio for Sensitivity 428 Degree Voil Coil Winding Endures Harshest Conditions During Play