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Old 22nd November 2002, 01:06 PM   #1
diyAudio Member
Join Date: Aug 2002
Location: Croatia
Question Xover question

Hi folks!

I found on web lowpass filter like this one, and author says that an little extra coil helps to supress cone breakup region. I wish to know how to calculate that extra coil, that is, to calculate it for known peak frequency of midbass.

Is there any equation for that?

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Old 23rd November 2002, 04:40 PM   #2
diyAudio Member
Join Date: Jul 2001
Location: Orleans, France
This filter exhibits a notch (zero transmission) at the resonnant frequency of C1L2 :

f = 1/[2*pi*sqr(LC)]

where f is in Hertz (cps) L in Henry and C in Farad.
If the notch is too sharp, add a small resistor in series with C1L2 (which can be the dc resistance of L2, if the wire is small in diameter)

Regards, Pierre Lacombe.
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