More on Amazon.com : http://www.amazon.com/gp/product/B002J9G5ZO?tag=purrfectcatdi-20 <br /> <br />MartinLogan DYN500D Dynamo 500 Subwoofer (Black) <br /> <br />10-inch polypropylene cone with a high-intensity magnet structure to achieve huge excursion and output capability without sacrificing detail <br />Amplifier incorporates innovative techniques to reduce noise distortion and heat to the lowest possible levels <br />Dynamo 500s connections and controls are designed to enable easy seamless integration with any stereo music multi-channel home theater system <br />Ports are a convenient and cost-effective way of increasing low-frequency output <br />Dynamo 500s high-density cabinet is carefully designed to minimize cabinet-induced resonances and provide an ideal baffle for linear operation <br />Dynamo 500s dual low-turbulence ports are carefully designed to provide superb low-end efficiency while minimizing port induced distortion
