Celestion NTR215010JD 21-Inch Neodymium 1600W RMS Subwoofer

It has 5" high temperature Inside/Outside voice coil efficiently dissipates heat, preventing sensitivity loss through thermal compression. It features Double suspension and a "multi-roll" surround provide exceptional linearity at extremes of cone excursion and Rigid lightweight carbon fibre loaded cone delivers improved performance and faster response. It has Intelligent heat management in both chassis and magnet assembly design further minimizes distortion.