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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°.
2nd Order Butterworth
High Pass Butterworth Filter Schematic
High Pass Filter
Second-Order Low Pass Filter Schematic
Low Pass Filter
Passive Bandpass Crossover Filter Schematic
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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