The Faital Pro 4FE42 4Ω 4-Inch Professional Woofer is a 100 mm loudspeaker driver with a nominal impedance of 4 Ohm. It provides 40 W AES power handling, 80 W maximum power handling, 93 dB sensitivity, and a 100÷20000 Hz frequency range. The driver uses a 25 mm voice coil, Kapton former, neodymium ring magnet, steel basket, and copper cap demodulation. Its depth is 54.1 mm, with a 91.5 mm baffle cutout diameter and 390 g net weight.