Mundorf BS140-3.9 | 3.9 mH | 0.20 Ω | 3% | 15 AWG

The Mundorf BS140-3.9 is a premium iron core coil engineered to deliver exceptional performance in high-fidelity loudspeaker crossover networks. As part of the renowned MCoil FERON Stack core series, this component is designed for audiophiles and loudspeaker builders who demand the highest level of precision and sonic transparency from their systems.

This 3.9 mH inductor is ideally suited for use in passive crossover filters, where accurate frequency division is critical to achieving a balanced and coherent soundstage. Whether you are constructing a new pair of reference speakers or upgrading an existing design, the BS140-3.9 excels in low-frequency applications, providing clean, controlled bass response without compromising midrange clarity. Its robust construction makes it a reliable choice for both professional and DIY audio projects.

Technically, the coil features a 15 AWG wire diameter of 1.45 mm, ensuring low DC resistance of just 0.20 Ω for minimal signal loss and efficient power handling. The ±3% tolerance guarantees consistent performance across production batches, while the iron core design maximises inductance in a compact form factor. With an RMS power tolerance of 4, this coil is built to handle demanding dynamic peaks without saturation or distortion.

In summary, the Mundorf BS140-3.9 offers a perfect blend of precision engineering and high-quality materials, making it an indispensable component for achieving audiophile-grade crossover performance.