# How to limit bass in speaker?

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

1. ### CMarangon

14
0
Feb 3, 2013
Hello!

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?

3,635
5
Apr 7, 2012
3. ### CMarangon

14
0
Feb 3, 2013
Hello!

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)

Where,
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
4. ### duke37

5,364
769
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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