Nominal Specifications Nominal Diameter 12", 300 mm Overall Diameter 12.44", 316 mm Bolt Circle Diameter 11.75", 298.5 mm Baffle Cutout Diameter 11.18", 284 mm Depth 6.13", 155.75 mm Flange and Gasket Thickness 0.49", 12.45 mm Electrical Specifications Minimum Impedance 6.3 Ohm Nominal Impedance 8 Ohm Nominal Power Handling*** 600 W Maximum Power Handling**** 1, 200 W Sensitivity (1W/1m) 98 dB Frequency Range 50 - 4000 Hz Voice Coil Diameter 3", 77 mm Winding Material Aluminium Former Material Glass Fiber Winding Depth 0.71", 18 mm Magnetic Gap Depth 0.47", 12 mm Flux Density 1.1 T THIELE & SMALL Parameters Resonant Frequency (fs) 50 Hz DC Resistance (Re) 5.1 Ohm BL Product (BL) 17.4 N/A Diaphragm Mass inc. Airload (Mms) 56 grams Mechanical Compliance of Suspension (Cms) 0.16 mm/N Rms 5.64 Kg/s Electromagnetic Q (Qes) 0.31 Mechanical Q (Qms) 3.3 Total Q (Qts) 0.28 Compliance Equivalent Volume (Vas) 2.04 ft³, 57.7 dm³ Surface Area of Cone (Sd) 77.5"², 500 cm² Maximum Linear Excursion (Xmax)* 7 mm Xdamage** 19.5 mm Coil Inductance (Le) 0.74 mH Diaphragm mass (Mmd) 49.7 g Eta Zero 2.6 % Notes *Xmax = [(winding depth - magnetic gap depth) / 2] + (magnetic gap depth / 3) **Maximum excursion before permanent damage ***2 Hours Test According to AES 2-1984 Rev. 2003 ****Maximum power is defined as 3dB greater than nominal power