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How to limit bass in speaker?

Discussion in 'General Electronics Discussion' started by CMarangon, Mar 5, 2013.

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  1. CMarangon


    Feb 3, 2013

    I have a speaker and wish to limit that frequencies that it plays be greater than 120 Hz.
    I know that it can be done using a capacitor.
    What is the formula to calculate the value of this capacitor?
  2. CMarangon


    Feb 3, 2013

    I have visited the page frm the link you give me. Thank you!

    It shows the formula:

    F = 0.159/ (C x Rh)
    A formula simplified, sufficient to my needs.

    I also noticed that the constant 0.159 comes from 1/2π,
    so the formula matematicaly most acurate is

    F= 1/(2.π.C.Rh)

    C - is the capacitance value (in Farads)
    Rh - is the impedance of the load speaker
    F - is the crossover frequency

    Thanks you very much!
    Last edited: Mar 6, 2013
  3. duke37


    Jan 9, 2011
    The capacitor will need to be quite large. You cannot use a standard electrolytic in this role. You will need a special AC version or a big plastic dielectric capacitor.
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