Enter the frequency and resistance into the Tweeter Capacitor Calculator to determine the capacitance, and this calculator can also evaluate any of the variables given the others are known.

Tweeter Capacitor Formula

C = 1 / (2πfR)

What is a Tweeter Capacitor?

A tweeter capacitor, also known as a crossover capacitor, is a key component in a speaker system that filters the audio signal, allowing only high-frequency signals to pass through to the tweeter. The tweeter is the speaker driver that produces the highest range of frequencies in a speaker system. The capacitor acts as a high-pass filter, blocking low frequency signals which could potentially damage the tweeter or degrade the audio quality. The value of the capacitor determines the frequency at which it starts to work. The higher the value of the capacitor, the lower the frequency it will allow to pass. This is crucial in ensuring that the tweeter only receives frequencies it is designed to handle, thus optimizing the overall performance and longevity of the speaker system.

How to Calculate Tweeter Capacitor?

The following steps outline how to calculate the Tweeter Capacitor.


  1. First, determine the capacitance value of the tweeter capacitor (Ct) in farads.
  2. Next, determine the frequency of the audio signal (f) in hertz.
  3. Next, gather the formula from above = Ct = 1 / (2 * pi * f).
  4. Finally, calculate the value of the tweeter capacitor.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

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

capacitance value of the tweeter capacitor (Ct) = 0.001 farads

frequency of the audio signal (f) = 1000 hertz