Fountek FW100B Bass-midwoofer

The Fountek FW100B Bass-midwoofer delivers tight, controlled bass and articulate midrange response, making it an ideal choice for audiophiles and DIY speaker builders seeking high-fidelity sound in compact designs. This 4-inch driver excels in small sealed or ported enclosures, where its precise engineering ensures accurate sound reproduction across critical low and mid frequencies. Perfectly suited for bookshelf speakers, near-field monitors, or multi-channel home theatre systems, the FW100B brings depth and clarity to any setup without demanding excessive cabinet volume.

Technically, the FW100B features a 101.6 mm nominal diameter with a 101.2 mm cutout and a mounting depth of just 60 mm, allowing easy integration into space-constrained projects. Its 6.2 ohm DC resistance and 0.3 mH voice coil inductance contribute to stable impedance and efficient power handling. The driver’s low total Q (Qts 0.63) balances mechanical (Qms 3.09) and electromagnetic (Qes 0.79) damping, ensuring controlled cone motion and reduced distortion. With a displacement volume (Vd) of 22 and mechanical losses (Rms) of 1.26, the FW100B delivers punchy, well-defined bass while maintaining a smooth midrange. Four mounting holes on a 114.5 mm bolt circle simplify installation, and the overall dimensions of 104.5 mm ensure a snug fit. Whether upgrading existing speakers or building from scratch, this Fountek driver offers reliable performance and sonic precision for discerning listeners.