The FAITAL PRO 3FE25-4 is a compact full-range loudspeaker. This speaker is known for its flat response across a wide frequency range, suitable for various audio applications where space is limited and high-quality sound is required. || NOMINAL SPECIFICATIONS || Nominal Diameter : 80 mm (3 in) || Overall Diameter : 105.6/81 mm (4.16/3.19 in) || Bolt Circle Diameter : 92 mm (3.62 in) || Baffle Cutout Diameter : 73.6 mm (2.90 in) || Depth : 54.5 mm (2.15 in) || Flange and Gasket Thickness : 6.5 mm (0.26 in) || Net Weight : 545 g (1.2 lb) || Shipping Box (Single Carton Box - 36 units) : 285 x 285 x 255 mm (11.2 x 11.2 x 10.0 in) || Shipping Weight (36 units) : 20.8 kg (45.9 lb) || || TECHNICAL PARAMETERS || Nominal Impedance : 4 Ohm || Minimum Impedance : 3.5 Ohm || AES Power Handling (1) : 20 W || Maximum Power Handling (2) : 40 W || Sensitivity (1W/1m) : 91 dB || Frequency Range : 100÷20000 Hz || Voice Coil Diameter : 19 mm (0.75 in) || Winding Material : Al || Former Material : Kapton || || TECHNICAL PARAMETERS || Winding Depth : 4.8 mm (0.19 in) || Magnetic Gap Depth : 4 mm (0.16 in) || Flux Density : 1.1 T || Magnet : Ferrite Ring || Basket Material : Steel || Demodulation : Copper Cap || Cone Surround (3) : Half Roll || NET Air Volume filled by Loudspeaker : 0.125 dm^3 (0.004 ft^3) || Spider Profile : 1x constant height waves || || THIELE AND SMALL PARAMETERS || Fs : 110 Hz || Re : 3.3 Ohm || Qes : 0.6 || Qms : 3.9 || Qts : 0.52 || Vas : 1.3 dm^3 (0.05 ft^3) || Sd : 33 cm^2 (5.12 in^2) || Xmax (4) : 1.73 mm || Xdamage (5) : 7.9 mm || Mms : 2.4 g || Bl : 3 N/A || Le : 0.04 mH || Mmd : 2.2 g || Cms : 0.87 mm/N || Rms : 0.4 kg/s || Eta Zero : 0.28 % || EBP : 183 Hz || || Brand : FAITAL PRO || Model Number : 3FE25-4 | 3FE25 || UPC : 810130951307 || PART NUMBER (P/N) Faston Terminals - 4 Ohm Version : 00804135 || NOTES || (1) 2 Hours Test According to AES 2-1984 Rev. 2003 || (2) Maximum power is defined as 3dB greater than nominal power || (3) NBR (Rubber) || (4) Xmax= [(winding depth - magnetic gap depth)/2] + (magnetic gap depth/3) || (5) Maximum excursion before permanent damage