DS18 2.2" Titanium Dome Surface Mount Tweeter, 60W MAX Sold in Pairs 30W RMS/60W Max 1 " KVC Voice Coil Titanium Diaphragm Machined Aluminum Body 4 Ohm Impedance Neodymium Magnet Frequency Response: 900 Hz - 20 kHz Recommended HI Pass Crossover: 3.8 KHz Sensitivity: 95.2dB Surface Mount Depth: 0.39" Overall Diameter: 2.28"