BMS 18 N 862 L, 18"" Neodymium Bass Driver, Nominal impedance: 8 Ohm, Nominal power rating: 1500 W, Maximum power rating: 3000 W, Sensitivity (1 W / 1 m): 95 dB, Frequency range: 20 - 200 Hz, Nominal diameter: 18"" / 457.2 mm, Voice coil: 4"" / 101.6 mm, Total diameter: 458 mm, Bolt circle diameter: 440 mm, Cut-out diameter: 412 mm, Number of mounting holes: 8, Diameter of mounting holes: 8.5 mm, Depth: 250 mm, Weight: 9.8 kg