8 inch Driver Subwoofer, 75W RMS (150W Dynamic Peak), High-Velocity Low-Turbulence Ported Design. Output is massive, thanks to heavy-duty, internally-braced cabinets, and Active Ridge Technology (ART™) for maximum driver-excursion. Massive SPL levels are coupled with precision control, intense detail and vanishingly low distortion. Completely Crafted in Canada, Defiance X outperforms every sub in their class.