The Faital Pro 4FE35 (8Ω, 4-Inch) Professional Woofer is a 100 mm loudspeaker driver with an 8 Ohm nominal impedance and 30 W AES power handling. It provides 91 dB sensitivity and a frequency range of 90÷20000 Hz. The driver uses a ferrite ring magnet, steel basket, copper cap demodulation, and a 19 mm voice coil with an Al winding on a Kapton former. Mounting dimensions include a 91.5 mm baffle cutout diameter, 115.26 mm bolt circle diameter, and 58.3 mm depth.