Specifications Nominal diameter 380 mm (15.0 in) Nominal impedance 8 Ω Minimum impedance 6.4 Ω Nominal power handling 500 W Continuous power handling 1000 W Sensitivity (1W/1m) 100.0 dB Frequency range 40 — 2000 Hz Voice coil diameter 76 mm (3.0 in) Winding material Copper Former material Glass Fibre Winding depth 19 mm (0.75 in) Magnetic gap depth 11 mm (0.43 in) Flux density 1.25 T Design Surround shape Triple Roll Cone shape Exponential Magnet material Ferrite Spider Double Silicone Pole design T-Pole Woofer cone treatment WP Waterproof Front Side Recommended enclosure 80.0 dm3 (2.82 ft3) Recommended tuning 50 Hz Parameters Fs 40 Hz Re 5.1 Ω Qes 0.22 Qms 5.1 Qts 0.21 Vas 138.0 dm3 (4.9 ft3) Sd 855.0 cm2 (132.5 in2) η₀ 3.9 % Xmax 7.0 mm Xvar 8.0 mm Mms 117 g Bl 26.2 Txm Le 1.4 mH EBP 181 Hz Mounting And Shipping Info Overall diameter 393 mm (15.5 in) Bolt circle diameter 374 mm (14.7 in) Baffle cutout diameter 354.0 mm (13.9 in) Depth 177 mm (6.97 in) Flange and gasket thickness 14 mm (0.55 in) Air volume occupied by driver 5.5 dm3 (0.19 ft3) Net weight 9.2 kg (20.2 lb) Shipping units 1 Shipping weight 10.5 kg (23.1 lb) Shipping box 420x420x200 mm (16.5×16.5×7.9 in)