The BMS exclusive voice coil technology employs a light weight Copper Clad Aluminium wire wound inside & outsde of the Kapton? former to improve the heat dissipation, dramtically increasing the acoustic output & reliability of the driver while minimising the power compression. Technische Daten 2" Middle Range Driver Unique patented Design 118 d B sensitivity 1 W / 1 m 300 Hz Crossover 90 mm Voice Coil