Crossover Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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Small changes can matter a lot in crossover. Electronics calculations often mix small component values with high switching frequencies, so prefixes such as µ, m, k, and M deserve careful attention. Use the calculator as a transparent first model, then decide whether your real system needs a more detailed treatment.

What this calculator does

Use this page to evaluate tweeter capacitor c₁ from Woofer impedance, Tweeter impedance, Crossover frequency. The result is most useful when the entered quantities describe one consistent physical setup and the displayed units stay attached to the number.

How to use it

Use measured, specified, or deliberately hypothetical values for Woofer impedance, Tweeter impedance, Crossover frequency. Keep the quantity definitions and unit prefixes exactly as labeled; a correct number in the wrong physical quantity or prefix will still produce a misleading result.

How the calculation works

The active path is a first-order two-way crossover: tweeter capacitor C = 1/(2πfcRt) and woofer inductor L = Rw/(2πfc). The visible speaker-count and filter-order selectors do not change this current formula.

Example

With the default setup (Woofer impedance = 8 Ω; Tweeter impedance = 8 Ω; Crossover frequency = 2000 Hz), the page reports tweeter capacitor c₁ of 0.00001 F. Treat the example as a consistency check, not a universal design target; its meaning depends on the inputs and assumptions above.

How to interpret the result

Treat the tweeter capacitor c₁ as an ideal circuit-design quantity for the entered topology and values. It is most useful for first-pass component sizing or comparison, followed by checks against ratings, tolerances, ripple, losses, and thermal behavior.

Limitations and notes

Despite the visible 2-way/3-way and 1st/2nd-order selectors, the current output always uses the same first-order two-way C and L equations. It does not calculate second-order components, a midrange branch, driver response, impedance variation with frequency, phase alignment, or acoustic crossover behavior.