1.Impedance:8Ohm 2.Magnet:78OZ 3.RMS:500Watts 4.OEM is welcome 5.CE&RoHS Noninal Diameter254mm(10in)Niminal Impedance8ΩMinimum impedance5 ΩPower Capacity500Watts RMSSensitivity(1w/1m)96dBFreq. Range40Hz~5.5KHZVoice Coil Diameter75.8MM(2IN)Winding MaterialCopperForwer MaterialKaptonMagnet MaterialCeramicMagnet78OZ Fs49.4HzBI21.4T*MQms6.1Re5ΩMns56.8gQes0.20Vas33.7LLe0.7MhQts0.18Sd0.0363m^2X-Max:4mm ...