Butterworth 2nd Order Crossover Network Design Formulas & Calculator

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Crossover Network Design Formulas & Calculator
This calculator will design a two-way second-order Butterworth crossover network for you. If you don't understand what any of the terms mean, click here for help.
Please note the reversed polarity wiring on the high pass filter. Second-order filters will usually give you a better overall frequency response when they are wired this way because this type of filter shifts the phase of the input signal 180°.

2^nd Order Butterworth
High Pass Filter	Low Pass Filter
Bandpass Filter
C₁ = .1125 / ( Rh x f )	L₁ = (.2251 x Rh ) / f
C₂ = .1125 / ( RL x f )	L₂ = (.2251 x RL ) / f

Calculate Your Crossover Here
To use this form, enter the impedance values (at the crossover frequency) for your speakers, and then enter the frequency you want your filter to crossover at. Now, click the "Calculate Values" button, and your results will appear in the empty text boxes.
Enter Tweeter Impedance Ohms Enter Woofer Impedance Ohms Enter Desired Crossover Frequency Hertz
HighpassLowpass
C₁ = Microfarads L₁ = Millihenries	C₂ = Microfarads L₂ = Millihenries

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Crossover Network Design Formulas & Calculator

C1 = .1125 / ( Rh x f )

L1 = (.2251 x Rh ) / f

C2 = .1125 / ( RL x f )

L2 = (.2251 x RL ) / f

C₁ = .1125 / ( Rh x f )

L₁ = (.2251 x Rh ) / f

C₂ = .1125 / ( RL x f )

L₂ = (.2251 x RL ) / f