Model:MWB-12 Power Rating: 150 Watts R.M.S / 300Watts Peak Sensitivity: 98?dB (1W / 1M) Imdepance:8ohm/4ohm/16ohm Fo:38?0% Hz Frequency Response: Fo-20KHz Voice Coil: 1.5"/Kapton Magnet: 50 oz