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Car Audio / Passive Crossovers, Zobel Filter Calculator

Use these formulas to calculate values of a capacitor and a resistor needed to construct a Zobel filter.

Before clicking for the capacitor and resistor values, enter the nominal impedance of the speaker and the frequency where the impedance has doubled. Capacitor values should be rounded off to the nearest hundredth.

If you need an 8 omh resistor, you can series two 4 ohm resistors. If you need a 3 fd capacitor, you can parallel two 1.5 fd capacitors. When the exact value of a capacitor is not available, you can substitute values of ± 5%.

Crossover Calculators:
High Pass/Low Pass Calculator
Narrow Band Pass Calculator
Zobel Calculator

top of page Zobel Filter Calculator
Nominal Impedance Frequency Impedance Doubles    


Ohms Hertz (Hz)    
Zobel (diagram)
C (fd) = 1,000,000 / (6.283 x Impedance x Frequency Impedance Doubles) Capacitor - C Microfarads (fd)
R = 1.25 x Nominal Impedance Resistor - R Ohms
<< Previous - Narrow Bandpass Crossover Formulas and Calculators



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