Enter the inductance and capacitance into the calculator to determine the crossover frequency. This calculator can also evaluate any of the variables given the others are known.

Subwoofer Crossover Formula

The following formula is used to calculate the crossover frequency for a subwoofer.

Fc = 1 / (2 * π * √(L * C))


  • Fc is the crossover frequency (Hz) L is the inductance (H) C is the capacitance (F) π is a constant (approximately 3.14159)

To calculate the crossover frequency for a subwoofer, first calculate the product of the inductance and the capacitance. Then, find the square root of this product. Multiply this result by 2 and then by π. Finally, divide 1 by this result to get the crossover frequency.

What is a Subwoofer Crossover?

A subwoofer crossover is a type of electronic filter circuit that routes audio signals based on their frequencies. It is used in audio applications to send low-frequency signals (typically below 200 Hz) to the subwoofer, while higher frequency signals are sent to other speakers. This ensures that the subwoofer only produces the deep bass sounds it is designed for, improving overall sound quality and preventing damage to the speakers.

How to Calculate Subwoofer Crossover?

The following steps outline how to calculate the Subwoofer Crossover using the given formula:

  1. First, determine the values of inductance (L) and capacitance (C) in the given problem.
  2. Next, substitute the values of L and C into the formula: Fc = 1 / (2 * π * √(L * C)).
  3. Calculate the square root of the product of L and C.
  4. Multiply the result by 2 and π.
  5. Finally, divide 1 by the previous result to find the crossover frequency (Fc).

Example Problem:

Use the following variables as an example problem to test your knowledge:

inductance (L) = 0.5 H

capacitance (C) = 0.02 F