Yamaha HS8S 150 Watt Professional Powered Subwoofer (Black)The HS Series features newly developed transducers that achieve astonishingly smooth response over a wide range of bandwidth. These transducers utilize an advanced magnetic field design that regulates the flow of magnetic response to provide seamless, natural sonic transitions. Each component's materials and design were carefully re examined, then optimized, to drastically improve the accuracy of signal reproduction throughout the audio spectrum. With