Specifications Nominal diameter 380 mm (15.0 in) Nominal impedance 8 Ω Minimum impedance 6.3 Ω Nominal power handling 400 W Continuous power handling 800 W Sensitivity (1W/1m) 98.5 dB Frequency range 40 — 3000 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 1.15 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 42 Hz Re 5.1 Ω Qes 0.34 Qms 7.9 Qts 0.33 Vas 135.0 dm3 (4.8 ft3) Sd 855.0 cm2 (132.5 in2) η₀ 2.9 % Xmax 7.0 mm Xvar 8.5 mm Mms 108 g Bl 21.0 Txm Le 1.3 mH EBP 123 Hz Mounting And Shipping Info Overall diameter 389 mm (15.31 in) Bolt circle diameter 374 mm (14.72 in) Baffle cutout diameter 353.0 mm (13.9 in) Depth 171 mm (6.73 in) Flange and gasket thickness 11 mm (0.43 in) Air volume occupied by driver 4.4 dm3 (0.15 ft3) Net weight 3.2 kg (7.0 lb) Shipping weight 3.7 kg (8.1 lb) Shipping box 340x340x170 mm (13.4×13.4×6.7 in)