" 10-inch polypropylene cone with a high-intensity magnet structure to achieve huge excursion and output capability without sacrificing detailbr Amplifier incorporates innovative techniques to reduce noise distortion and heat to the lowest possible levelsbr Dynamo 500s connections and controls are designed to enable easy seamless integration with any stereo music multi-channel home theater systembr Ports are a convenient and cost-effective way of increasing low-frequency outputbr Dynamo 500s high-density cabinet is carefully designed to minimize cabinet-induced resonances and provide an ideal baffle for linear operationbr Dynamo 500s dual low-turbulence ports are carefully designed to provide superb low-end efficiency while minimizing port induced distortion br MartinLogan DYN500D Dynamo 500 Subwoofer (Black)"