Calculate speaker crossover frequency for passive and simple audio filter circuits. Choose a high-pass capacitor, low-pass inductor, RC filter, or target-frequency mode to estimate crossover point, required component values, and filter range.
High-pass capacitor mode:
Uses speaker impedance and capacitor value to estimate the frequency where low frequencies begin rolling off.
Low-pass inductor mode:
Uses speaker impedance and inductor value to estimate the frequency where high frequencies begin rolling off.
Target mode:
Uses a desired crossover frequency and speaker impedance to estimate the needed capacitor or inductor value.
A crossover frequency calculator helps estimate basic component values for tweeters, woofers, subwoofers, midrange drivers, and simple passive speaker filters.
This calculator is best for rough first-order estimates. Real crossover design also depends on driver impedance curves, acoustic response, phase, enclosure, baffle effects, and component tolerances.
Common first-order crossover formulas used by this calculator:
Crossover frequency is the point where an audio signal is divided between drivers, such as a woofer and tweeter, or between a speaker and subwoofer.
For a simple first-order passive crossover, use f = 1 ÷ (2πRC) for a capacitor high-pass or f = R ÷ (2πL) for an inductor low-pass.
A common starting range is about 60 to 100 Hz, with 80 Hz often used as a practical starting point for many home theater systems.
A single capacitor can provide basic first-order high-pass protection, but a proper speaker crossover may need more parts to control response, phase, impedance, and driver blending.