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Speaker Crossover Calculator — 1st-Order High-Pass & Low-Pass
Calculate ideal first-order passive speaker crossover capacitor and inductor values from nominal impedance and crossover frequency.
Last updated: September 16, 2026
Results
High-pass capacitor 9.947184 µF
Low-pass inductor 0.6366198 mH
Formula, example and assumptions
C=1/(2πRf); L=R/(2πf).
At 8 Ω and 2 kHz, a first-order network uses about 9.95 µF and 0.637 mH ideal values.
- Nominal resistive speaker impedance and first-order 6 dB/octave sections.
- Real driver impedance, acoustic slopes, baffle effects and driver response require measurement-based crossover design.
Frequently asked questions
Why does real crossover behavior differ?
Loudspeaker impedance changes with frequency and the acoustic driver response adds its own slope and phase.
Is this for first-order networks only?
Yes. It intentionally avoids pretending higher-order networks can be designed from nominal impedance alone.