Speaker Crossover Calculator

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A 2-way crossover splits the signal into two bands; a 3-way adds a dedicated midrange driver.
Higher orders roll off faster but need more components. 2nd and 4th order are most common in hi-fi.
Butterworth gives the flattest amplitude; Linkwitz-Riley sums to flat when both sections are combined; Bessel preserves transient accuracy.
The frequency at which the filters cross over. For a 2-way, this is the single crossover point.
Hz
Nominal impedance of the woofer (or subwoofer) driver. Typically 4, 6, or 8 ohms.
ohm
Nominal impedance of the tweeter. Typically 4, 6, or 8 ohms.
ohm
Woofer L1
0.720 mH

Low-pass first inductor (mH)

Woofer C111.25 µF
Tweeter C15.63 µF
Tweeter L10.360 mH
Roll-off rate12 dB/octave
Attenuation at crossover-3 dB per section

2nd-order Butterworth 2-way crossover at 2,500 Hz

  • The filter rolls off at 12 dB/octave, meaning the signal level halves roughly every octave beyond the crossover frequency.
  • Butterworth filters provide the flattest in-band amplitude response with no ripple, making them the most common choice for speaker crossovers.

Next stepComponent values are for ideal resistive loads. Real drivers have rising impedance at higher frequencies. Consider adding a Zobel (impedance compensation) network in parallel with each driver for best accuracy.

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