Crossover Frequency Calculator

Calculate passive crossover component values (inductors and capacitors) for 1st, 2nd, and 3rd order Butterworth crossover networks.

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How It Works

Passive crossovers split the audio signal between drivers. 1st order (6 dB/octave): simplest, one component per filter (LP = inductor, HP = capacitor). 2nd order Butterworth (12 dB/octave): L and C per filter, flat magnitude response. 3rd order (18 dB/octave): better driver protection, more phase shift. Formulas: C = 1/(2πfZ), L = Z/(2πf) for 1st order, multiply by √2 for 2nd order Butterworth. Use non-polarized capacitors (polypropylene preferred) and air-core inductors for tweeters.