MAX Power: 150 Watt (RMS Power: 75 Watt)4 Ohm Impedance20 oz. Circuit MagnetVoice Coil: 1.0', AluminumFrequency Response: 80Hz - 18kHzSpeaker Total Diameter: 180mmSpeaker Cut-Out Diameter: 135mmSpeaker Mounting Depth: 63mm