*Airflow vented magnet assembly for dynamic heat dispersion *Nominal Diameter305mm/12in *Nominal Power Rating350W *Continuous Power Rating700W *Sensitivity94dB *Rated Impedance8Ω *Frequency Range45Hz-3000Hz *Voice coil diameter (mm)75mm *Voice coil diameter (in)3in *Chassis TypePressed steel *Magnet TypeFerrite *Magnet Weight1.4kg/48oz *Voice coil materialRound copper *Former MaterialPolyimide *Cone materialKevlar loaded paper *Surround MaterialCloth-sealed