Baked Varnish Wire/ Resin Soaking

Baked varnish wire is enamel-insulated wire with an additional, activatable hot-melt outer layer, which has an adhesive effect when heated. The windings are thus fixed together.

Impact in practice

• The coil becomes mechanically stable and „works“ significantly less
• Micro-movements between windings are reduced
• In particular, this reduces macro-microphonic effects (the windings „work“ less) and increases “silence” during operation

Resin soaking as an alternative to baked varnish wire

If no baked lacquer wire is used, resin soaking carried out under vacuum can take over the mechanical fixing. The resin penetrates into the wrap, reduces cavities and degrees of freedom of movement and transforms the wrap into a stable compound. The result: significantly less macro microphones and an overall quieter, more precise operation of the coil.

OFC Copper

• Purity: at least 99.995% Cu, often 99.999% (4N) or higher
• Feature: almost oxygen-free (typically <10 ppm)
• Result: more stable grain boundaries, less oxide formation, more uniform electron flow

Zero-Ohm Core

The Feron zero-ohm coil combines E and I cores with a defined air gap that prevents core saturation and enables extremely low R_DC values with high inductance. The core size determines R_DC and load capacity; our zero-ohm coils are designed to guarantee at least 300 watts, and significantly more for larger cores or smaller inductors.

The defined air gap ensures controlled behavior under load and high level reserves. This design is typically mounted in the housing.

The result: maximally tight, controlled bass without compression.