Crossover Frequency
3,000 Hz
Order
12 dB/oct
Z
8 Ω
Crossover Components
3,000 Hz
Low-Pass (Woofer)
High-Pass (Tweeter)
Inputs
Result
L = 8×1.414/(2π×3000) = 0.600mH. C = 1/(2π×3000×8×1.414) = 4.69µF.
Inputs
Result
L = 8/(2π×3000) = 0.424mH. C = 1/(2π×3000×8) = 6.63µF.
For 1st order at 3kHz with 8Ω drivers: LP inductor = Z/(2πf) = 0.424mH, HP capacitor = 1/(2πfZ) = 6.63µF. 2nd order Butterworth uses √2 factor.
| Order | Slope | Components | Phase Shift |
|---|---|---|---|
| 1st | 6 dB/oct | 1 per filter | 90° |
| 2nd | 12 dB/oct | 2 per filter | 180° |
| 3rd | 18 dB/oct | 3 per filter | 270° |
| 4th | 24 dB/oct | 4 per filter | 360° |
Typical 2-way: 2–4kHz. The tweeter should handle 1 octave below crossover. For a tweeter rated to 2kHz, cross at 3–4kHz minimum.
1st order (6dB/oct): simplest, best transient response, but weak separation. 2nd order (12dB/oct): better driver protection, standard for most DIY speakers.
Yes. Higher impedance requires larger inductors and smaller capacitors. 8Ω is standard; 4Ω drivers need half the inductance and double the capacitance for the same frequency.
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Last Updated: Mar 20, 2026
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