Specifications Nominal diameter 380 mm (15.0 in) Nominal impedance 8 Ω Minimum impedance 6.7 Ω Nominal power handling 500 W Continuous power handling 1000 W Sensitivity (1W/1m) 99.0 dB Frequency range 40 — 2000 Hz Voice coil diameter 76 mm (3.0 in) Winding material Copper Former material Glass Fibre Winding depth 18 mm (0.68 in) Magnetic gap depth 11 mm (0.4 in) Flux density 1.25 T Design Surround shape Triple Roll Cone shape Exponential Magnet material Neodymium Inside Slug Spider Single Pole design Straight Pole Woofer cone treatment WP Waterproof Front Side Recommended enclosure 100.0 dm3 (3.53 ft3) Recommended tuning 47 Hz Parameters Fs 37 Hz Re 5.3 Ω Qes 0.24 Qms 4.5 Qts 0.22 Vas 195.0 dm3 (6.8 ft3) Sd 855.0 cm2 (132.5 in2) η₀ 4.1 % Xmax 7.0 mm Xvar 9.0 mm Mms 96 g Bl 22.5 Txm Le 1.5 mH EBP 154 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 171 mm (6.7 in) Flange and gasket thickness 16 mm (0.62 in) Air volume occupied by driver 3.5 dm3 (0.12 ft3) Net weight 4.6 kg (10.1 lb) Shipping units 1 Shipping weight 5.9 kg (13.0 lb) Shipping box 420x420x200 mm (16.5×16.5×7.9 in)