1.Impedance:4Ohm 2.Magnet:97OZ 3.RMS:600Watts 4.OEM is welcome 5.CE&RoHS Noninal Diameter380mm(15in)Niminal Impedance4ΩMinimum impedance3.2 ΩPower Capacity600Watts RMSSensitivity(1w/1m)97dBFreq. Range30Hz~3.5KHZVoice Coil Diameter75.8MM(3IN)Winding MaterialCopperForwer MaterialKaptonMagnet MaterialCeramicMagnet97OZ WF1501 15 Inch PA Woofer,PA Speaker