Intertechnik HQP56/3.9/12 | 3.9 mH | 0.42 Ω | 5% | 17 AWG | Mushroom Core Coil

The Intertechnik Ferrobar mushroom-shaped ferrite core coil delivers exceptional performance for demanding audio crossover networks. With a precise 3.90 mH inductance and a tight ±5.0% tolerance, this high-quality component ensures accurate frequency filtering in your speaker designs. Its robust construction makes it ideal for both DIY enthusiasts and professional audio engineers seeking reliable, long-lasting performance in passive crossover circuits.

This coil excels in a variety of audio applications, particularly in two-way and three-way speaker systems where precise bass and midrange crossover points are critical. The mushroom-shaped ferrite core design minimises magnetic saturation and distortion, allowing for clean signal transmission even at higher power levels. Whether you are building custom loudspeakers or upgrading existing designs, this coil provides the stability and consistency required for audiophile-grade sound reproduction.

Technically, the coil features a 1.12 mm copper wire diameter, resulting in a low DC resistance of just 0.42 Ω, which reduces power loss and maintains efficiency. The outer diameter measures 56 mm, with a recess diameter of 25.5 mm and a central hole of 5 mm for easy mounting. The core diameter is 28 mm, total height is 35 mm, and the winding width is 23 mm, ensuring a compact yet powerful component. These specifications guarantee reliable performance and straightforward integration into your crossover designs.

In summary, the Intertechnik Ferrobar coil combines precision engineering with practical design, making it an excellent choice for high-fidelity audio projects. Its low resistance, tight tolerance, and robust ferrite core ensure accurate filtering and long-term reliability, delivering the sonic clarity you expect from premium audio components.