Specifications Nominal diameter 380 mm (15.0 in) Nominal impedance 8 Ω Minimum impedance 6.3 Ω Nominal power handling 550 W Continuous power handling 1100 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 19 mm (0.75 in) Magnetic gap depth 11 mm (0.4 in) Flux density 1.15 T Design Surround shape Triple Roll Cone shape Exponential Magnet material Ferrite Spider Double Silicone Pole design T — Pole Woofer cone treatment None Recommended enclosure 110.0 dm3 (3.88 ft3) Recommended tuning 45 Hz Parameters Fs 38 Hz Re 5.0 Ω Qes 0.28 Qms 5.2 Qts 0.26 Vas 164.0 dm3 (5.7 ft3) Sd 855.0 cm2 (132.5 in2) η₀ 3.3 % Xmax 7.5 mm Xvar 8.5 mm Mms 106 g Bl 22.1 Txm Le 1.3 mH EBP 135 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 0.0 dm3 (0.0 ft3) Net weight 8.7 kg (19.1 lb) Shipping weight 10.1 kg (22.2 lb) Shipping box 420x420x200 mm (16.5×16.5×7.9 in)