Definitive Technology Descend DN15 15 Powered SubwooferDN15 Ultra-Performance, 1500W 15 Subwoofer with Dual 15 Bass RadiatorsMassive, uncompromised bass performance, from our most powerful subwoofer ever. Unique technologies add unprecedented clarity, power and seamless system integration.More Bass from the Same SpaceThe DN15’s unique 3XR Architecture provides triple the bass-producing surface area of a traditional 15” ported subwoofer. This extra surface area moves more air, resulting in monumental low end. And because 3XR doesn’t use ports