Duelund Coherent Audio CAST-PIO-12-CU-1 | 1 mH | 5% | 12 AWG | CAST 12 AWG Copper Foil Air-Core Inductor

Highlights of the CAST-PIO-12-CU-1

• 1 mH copper foil air-core inductor with 2% tolerance
• 12 AWG copper foil construction with 150 micrometer foil thickness and 20 mm foil height
• Waxed and oiled paper insulation on a compressed paper former
• Fully vacuum impregnated using Duelund’s proprietary WPIO dielectricum
• CAST process provides exceptional mechanical stability and damping
• Terminated with twisted copper leadouts

Product details CAST-PIO-12-CU-1

Duelund Coherent Audio CAST-PIO-12-CU-1 1 mH 2% 12 AWG Copper Foil Air-Core Inductor

The CAST-PIO-12-CU-1 is built for demanding audio crossover work, using pure copper foil wound onto a compressed paper former and insulated with waxed and oiled paper. As one of Duelund’s premium crossover components, it is intended for use in audio crossover networks, filters and electronics where a natural, clear and dynamic sound is required.

Duelund’s CAST construction is central to the performance of this inductor. The proprietary WPIO dielectricum is applied through a high-pressure impregnation process that takes several days, followed by a rigorous casting process. This creates a highly damped and mechanically stable structure that helps reduce vibration-related effects and microphony.

The copper foil version uses 150 micrometer thick copper foil with a 20 mm height, equivalent to 12 AWG. The design is terminated with twisted copper leadouts, supporting a robust connection in high-quality passive loudspeaker filter layouts and other premium audio circuits where foil coils are preferred.

Because it is an air-core inductor, the CAST-PIO-12-CU-1 avoids core saturation while maintaining Duelund’s focus on low resistance, low distortion and high thermal stability. Its combination of vacuum impregnation, CAST damping and copper foil construction makes it a strong choice for audiophile-grade builds and upgrades.