Car Audio / Passive Crossovers, High Pass/Low Pass Capacitor & Coil Calculator

Use these formulas to calculate for first, second, and third order low pass, high pass, and band pass filters. Do not use these for narrow band pass filter calculations.

If you need a 16 mHy coil, you can series a 12.8 mHy coil and a 3.2 mHy coil. If you need a 70 µfd capacitor, you can parallel two 35 µfd capacitors.When the exact value of a coil or capacitor is not available, you can substitute values of ± 5%.

Passive Crossover Capacitor and Coil Calculator

Capacitor and Coil Calculator Impedance Frequency     Ohms Hertz (Hz)     1st Order (6 dB per Octave) (diagrams) L1 (mHy) = (1000 x Impedance) / (6.283 x Crossover Frequency) Coil - L1 Millihenries (mHy) C1 (µfd) = 1,000,000 / (6.283 x Impedance x Crossover Frequency) Capacitor - C1 Microfarads (µfd) 2nd Order (12 dB per Octave) (diagrams) L2 = L1 x 1.414 Coil - L2 Millihenries (mHy) C2 = C1 x .707 Capacitor - C2 Microfarads (µfd) 3rd Order (18 dB per Octave) (diagrams) L3 = L1 x 1.5 Coil - L3 Millihenries (mHy) C3 = C1 x .1.33 Capacitor - C3 Microfarads (µfd) L4 = L1 x .5 Coil - L4 Millihenries (mHy) C4 = C1 x .667 Capacitor - C4 Microfarads (µfd) L5 = L1 x .75 Coil - L5 Millihenries (mHy) C5 = C1 x 2 Capacitor - C5 Microfarads (µfd)

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