DS18 2.03" Phenolic Compression Driver (Sold Each) Type: Bolt-on Titanium Compression Driver RMS Power: 320W MAX Power: 640W Sensitivity: 109dB Throat Diameter: 2" Voice Coil Size: 2.03" Impedance: 8 ohm Frequency Response: 500 Hz - 20 KHz Recommended Hi Pass Crossover: 800 Hz VC Former Material: Kapton Winding Material: CCA Diaphragm Material: Phenolic Magnet Material: Ferrite Magnet Weight: 35 oz. Bolt Pattern: M6 - 4" Overall Diameter: 5.27" Overall Depth: 2.4"