Additional Details ------------------------------ Product description: Dayton Audio?s ground breaking Epique E180HE-44 7? with a carbon fiber cone and dual voice coils, introduces the world to a new class of speaker driver . . . an Extended Range Subwoofer (ERS). It was engineered to produce premium controlled subwoofer performance, while simultaneously achieving a smooth extended high frequency response. Thanks to its revolutionary MMAG dual gap motor, the motor force is nearly constant even when driven to the limits of its 14 mm Xmax. Capable of unheard-of excursion for its size while delivering smooth midrange response with low distortion, the E180HE-44 woofer gives you the opportunity to create systems that provide extraordinary accuracy and fidelity.