Nominal Specifications Throat Diameter 1", 25.4 mm Overall Diameter 4.02", 102 mm Depth 2.13", 54 mm 180° Mounting Holes Diameter (2xM6) 2.99", 76 mm 120° Mounting Holes Diameter (3xM6) 2.24", 57 mm Electrical Specifications Nominal Impedance 8 Ohm Minimum Impedance 6.5 Ohm Re 5.8 Ohm Minimum Crossover Frequency* 1.3 kHz Sensitivity (1W/1m)** 109 dB Frequency Range 1 - 20 kHz Nominal Power Handling*** 60 W Maximum Power Handling**** 120 W Diaphragm Material Ketone Polymer Voice Coil Diameter 1.73", 44 mm Winding Depth 0.10", 2.45 mm Former Material Kapton Magnetic Gap Depth 0.11", 2.75 mm Flux Density 1.9 T Winding Material Copper Clad Aluminium Notes *12 dB/oct or higher slope high-pass filter **Averaged within the frequency range ***Test made for 2 hours with Pink Noise signal (6 dB Crest Factor) from minimum crossover frequency. Power calculated on rated minimum impedance. Driver mounted on aluminium horn. ****Maximum power is defined as 3dB greater than nominal power