Calculator and formulas for loudspeaker crossovers 2. order with 12 dB attenuation per octave
This page calculates the coils and capacitors for a 2nd order loudspeaker crossover. The crossover has a coil and a capacitor for each speaker to separate the frequency. The damping is 12 dB per octave.
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A 2nd order crossover requires 2 components in each branch. The slope is 12dB per octave. The values of the capacitors and coils in the high and low pass are identical.
Also pay attention to the polarity of the loudspeakers. Since the current lags behind the voltage by 180° in the low-pass filter at the crossover frequency, and at the high-pass filter the voltage also lags behind the current by 180°, the membranes of the loudspeakers move in phase. This means that both loudspeakers are polarized in the same way.
| Coil | \(\displaystyle L=\frac{\sqrt{2}\cdot Z}{2\cdot π \cdot f_C}\) |
| Capacitor | \(\displaystyle C=\frac{\sqrt{2}}{4\cdot π\cdot f_C\cdot Z }\) |
| Capacitor | \(C\;[F]\) |
| Coil | \(L\;[H]\) |
| Speaker impedance | \(Z\;[Ω]\) |
| Crossover Frequency | \(f_C\;[Hz]\) |
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