1.0mm Oxygen-Free Copper Air Core Inductor — Speaker Crossover Coil 0.07mH–3.3mH

1.0mm Oxygen-Free Copper Air Core Inductor — Speaker Crossover Coil 0.07mH–3.3mH

These 1.0mm oxygen-free copper (OFC) air core inductors are wound specifically for passive speaker crossover networks. Unlike iron-core inductors, the air core design eliminates magnetic saturation and hysteresis distortion, delivering cleaner, more accurate frequency division across the audio band. With inductance values from 0.07mH to 3.3mH and a ±5% tolerance, these coils are suitable for woofer low-pass and midrange bandpass sections in 2-way and 3-way passive crossover designs.

Key Specifications

Parameter	Value
Wire Material	Oxygen-Free Copper (OFC), 1.0mm diameter
Core Type	Air core (no magnetic core)
Inductance Range	0.07mH – 3.3mH (select variant)
Inductance Tolerance	±5%
DCR (DC Resistance)	Varies by inductance value (lower for smaller values)
Application	Passive speaker crossover networks (low-pass, bandpass filters)
Origin	CN

Air Core vs Iron Core Inductors for Audio

Feature	Air Core (This Product)	Iron Core
Magnetic Saturation	✅ None — linear at all power levels	❌ Saturates at high power
Hysteresis Distortion	✅ Zero	❌ Present, adds coloration
DCR	❌ Higher (more wire needed)	✅ Lower
Size	❌ Larger for same inductance	✅ More compact
Best Use	Tweeter & midrange crossover, audiophile builds	Woofer low-pass in high-power systems

Typical Applications

• 2-way passive crossover woofer low-pass filter (L-pad section)
• 3-way passive crossover midrange bandpass filter
• DIY audiophile speaker crossover upgrades
• Replacement for degraded or incorrect-value crossover inductors
• Tube amplifier output filter and choke applications

Frequently Asked Questions

Q: How do I select the right inductance value for my crossover?

Use the standard crossover filter formula: L = Z / (2π × f) for a first-order (6dB/octave) low-pass filter, where Z is the driver impedance (typically 4Ω or 8Ω) and f is the crossover frequency in Hz. For higher-order filters, use a crossover design calculator (e.g., the one at crossover-calculator.com) to determine the exact L and C values.

Q: What is the power handling of these inductors?

Power handling depends on the DCR and wire gauge. The 1.0mm OFC wire handles continuous audio power well for most home audio applications (up to ~100W RMS per channel). For high-power PA or subwoofer applications above 200W, consider 1.2mm or 1.4mm wire inductors.

Package Contents

• 1× 1.0mm OFC Air Core Crossover Inductor (inductance value per selected variant)

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