SA-12 D2 REV.3- Sundown Audio 12" 750W Dual 2-Ohm SA Series Subwoofer 19.0mm XMax by 70% BL method oneway (38.0mm peak to peak) Thick black anodized aluminum voice coil formers for maximum strength and heat dissipation High efficiency airflow management integrated into the motor for maximum voice coil cooling Dual Aluminum Faraday rings for reduced inductance and inductive distortion (pole cap and magnet ID) TwoYear Warranty against defects in materials and workmanship