Aluminum Super Tweeter - 4 Ohms Impedance * Die Cast Frame - Ferro Fluid Enhanced Voice Coil * 1.75 inches High Temperature Kapton Voice Coil - Sensitivity: 102dB (1w/1m) * Neodymium Magnet Structure - Frequency Response: 2k-20kHz * 300 Watts RMS/600 Watts Rated Power - 4.52 inches Diameter/2.83 inches Mounting Depth