DS18 3" Compression Driver (Sold Each) Throat Diameter: 2" Installation Type: Bolt-on Impedance: 8 ohms RMS Power Handing: 500 Watts Maximum Power Handing: 1000 Watts Sensitivity (1w/1m): 110dB Frequency Response: 600 Hz - 18 KHz Recommended Hi Pass Crossover: 900 Hz Voice Coil Diameter: 3" Diaphragm Material: Titanium Voice Coil Former Material: Kapton Winding Material: Aluminum Magnet Material: Ferrite Magnet Weight: 75 oz. Body Material: Aluminum Overall Diameter: 7.08 " Overall Depth: 4.25 " 108 mm Bolt Pattern: M6