# Crossover Calculator

This crossover calculator can be employed for the calculation of passive filters (first, second, third, and fourth order) in two-way and three-way crossover networks. It will also create a circuit diagram and provide the component values you require.

Instructions: Select your crossover type (two-way or three-way), input impedance values for tweeter, woofer and midrange (with a three-way crossover network), choose the order/type of the filter, input the crossover frequency, and click on the "Calculate" button. The calculator will then provide the component values required for the crossover type you have chosen.

Crossover Plan Calculator

Ohms (Ω)

Ohms (Ω)

Hertz (Hz)

The crossover calculator uses the following formulae:

Two-Way Crossover Network Plan Formulae

1st Orden Butterworth1st Orden Solen Split -6 db
C1 = .159/RHf.1125/(RHf)
L1 = RL/6.28f.2251RL/f

2nd Orden
Bessel
2nd Orden
Butterworth
2nd Orden
Chebyshev
2nd Orden
C1 = .0912/(RHf).1125/(RHf).1592/(RHf).0796/(RHf)
C2 = .0912/(RLf).1125/(RLf).1592/(RLf).0796/(RLf)
L1 = .2756RH/f.2251RH/f.1592RH/f.3183RH/f
L2 = .2756RL/f.2251RL/f.1592RL/f.3183RL/f

3nd Orden Butterworth3nd Orden Bessel
C1 = .1061/(RHf).0791/(RHf)
C2 = .3183/(RHf).3953/(RHf)
C3 = .2122/(RLf).1897/(RLf)
L1 = .1194RH/f.1317RH/f
L2 = .2387RL/f.3294RL/f
L3 = .0796RL/f.0659RL/f

4th Orden
Bessel
4th Orden
Butterworth
4th Orden
Gaussian
C1 = .0702/(RHf).1040/(RHf).0767/(RHf)
C2 = .0719/(RHf).1470/(RHf).1491/(RHf)
C3 = .2336/(RLf).2509/(RLf).2235/(RLf)
C4 = .0504/(RLf).0609/(RLf).0768/(RLf)
L1 = .0862RH/f.1009RH/f.1116RH/f
L2 = .4983RH/f.4159RH/f.3251RH/f
L3 = .3583RL/f.2437RL/f.3253RL/f
L4 = .1463RL/f.1723RL/f.1674RL/f

4th Orden
Legendre
4th Orden
Linear-Phase
4th Orden
C1 = .1104/(RHf).0741/(RHf).0844/(RHf)
C2 = .1246/(RHf).1524/(RHf).1688/(RHf)
C3 = .2365/(RLf).2255/(RLf).2533/(RLf)
C4 = .0910/(RLf).0632/(RLf).0563/(RLf)
L1 = .1073RH/f.1079RH/f.1000RH/f
L2 = .2783RH/f.3853RH/f.4501RH/f
L3 = .2294RL/f.3285RL/f.3000RL/f
L4 = .2034RL/f.1578RL/f.1500RL/f

Note: The values are in Farads (C1 - Cn), Henries (L1 - Ln), Hertz (f) and Ohms (RH, RL).

Three-Way Crossover Network Plan Formulae

1st Orden Normal Polarity
fH/fL=10
1st Orden Normal Polarity
fH/fL=8
C1 = .1590/(RHfH).1590/(RHfH)
C2 = .5540/(RMfM).5070/(RMfM)
L1 = .0458RM/fM.0500RM/fM
L2 = .1592RL/fL.1592RL/fL

2nd Orden (Reverse Midrange Polarity)
fH/fL=10
2nd Orden (Reverse Midrange Polarity)
fH/fL=8
C1 = .0791/(RHfH).0788/(RHfH)
C2 = .3236/(RMfM).3046/(RMfM)
C3 = .0227/(RMfM).0248/(RMfM)
C4 = .0791/(RLfL).0788/(RLfL)
L1 = .3202RH/fH.3217RH/fH
L2 = 1.0291RM/fM.9320RM/fM
L3 = .0837RM/fM.0913RM/fM
L4 = .3202RL/fL.3217RL/fL
Prohibitdpass Gain = 2.08dbProhibitdpass Gain = 2.45db

3rd Orden Normal Polarity
fH/fL=10
3rd Orden Normal Polarity
fH/fL=8
C1 = .1138/(RHfH).1158/(RHfH)
C2 = .2976/(RHfH).2927/(RHfH)
C3 = .0765/(RMfM).0884/(RMfM)
C4 = .3475/(RMfM).3112/(RMfM)
C5 = 1.068/(RMfM).9667/(RMfM)
C6 = .2127/(RLfL).2130/(RLfL)
L1 = .1191RH/fH.1189RH/fH
L2 = .0598RM/fM.0634RM/fM
L3 = .0253RM/fM.0284RM/fM
L4 = .3789RM/fM.3395RM/fM
L5 = .2227RL/fL.2187RL/fL
L6 = .0852RL/fL.0866RL/fL
Prohibitdpass Gain = .85dbProhibitdpass Gain = .99db

3rd Orden (Reverse Midrange Polarity)
fH/fL=10
3rd Orden (Reverse Midrange Polarity)
fH/fL=8
C1 = .0995/(RHfH).0980/(RHfH)
C2 = .3402/(RHfH).3459/(RHfH)
C3 = .0683/(RMfM).0768/(RMfM)
C4 = .3128/(RMfM).2793/(RMfM)
C5 = 1.148/(RMfM)1.061/(RMfM)
C6 = .2126/(RLfL).2129/(RLfL)
L1 = .1191RH/fH.1190RH/fH
L2 = .0665RM/fM.0711RM/fM
L3 = .0233RM/fM.0254RM/fM
L4 = .4285RM/fM.3951RM/fM
L5 = .2546RL/fL.2586RL/fL
L6 = .0745RL/fL.0732RL/fL
Prohibitdpass Gain = 1.6dbProhibitdpass Gain = 2.1db

4th Orden Normal Polarity
fH/fL=10
4th Orden Normal Polarity
fH/fL=8
C1 = .0848/(RHfH).0849/(RHfH)
C2 = .1686/(RHfH).1685/(RHfH)
C3 = .3843/(RMfM).3774/(RMfM)
C4 = .5834/(RMfM).5332/(RMfM)
C5 = .0728/(RMfM).0799/(RMfM)
C6 = .0162/(RMfM).0178/(RMfM)
C7 = .2523/(RLfL).2515/(RLfL)
C8 = .0567/(RLfL).0569/(RLfL)
L1 = .1004RH/fH.1007RH/fH
L2 = .4469RH/fH.4450RH/fH
L3 = .2617RM/fM.2224RM/fM
L4 = 1.423RM/fM1.273RM/fM
L5 = .0939RM/fM.1040RM/fM
L6 = .0445RM/fM.0490RM/fM
L7 = .2987RL/fL.2983RL/fL
L8 = .1502RL/fL.1503RL/fL
Prohibitdpass Gain = 2.28dbProhibitdpass Gain = 2.84db

Note: The values are in Farads (C1 - Cn), Henries (L1 - Ln), Hertz (fH, fM, fL) and Ohms (RH, RM, RL). ? fM = (fH × fL)1/2

Reference: Dickason, Vance. (2006). The Loudspeaker Plan Cookbook. 7th edition. Audio Amateur Press. pp 163 - 169