12 inch (305 mm) Driver with ART™ Surround, 650W RMS (1300W Dynamic Peak), Class-D amplifier, App controlled via smartphone, Anthem Room Correction (ARC®) Included. 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.