Multiple notch filters?

Mikael Abdellah · 25th August 2006, 09:56 AM

I would like to correct a rather large hump in the freq range of a wide range driver. I need to loose about 15dB around 3kHz. Is it possible to wire 5 pcs of parallel notch filter in series???

badman · 25th August 2006, 01:12 PM

Yes, if you wanted to have a 15dB notch filter, you could do 5 in series, but they wouldn't simply sum the way you're hoping.

Better is to notch it out line level, for such a dramatic notch. This will take some calculation (or a high-resolution equalizer).

If you must do it speaker level, you would probably have to do a multiple component filter.

Mikael Abdellah · 25th August 2006, 05:09 PM

I was afraid/hoping an active crossover would be the best way. I will try to find some information and formulas on the subject.

25th August 2006, 09:56 AM	#1
Mikael Abdellah diyAudio Member Join Date: Jan 2003 Location: Sweden	Multiple notch filters? I would like to correct a rather large hump in the freq range of a wide range driver. I need to loose about 15dB around 3kHz. Is it possible to wire 5 pcs of parallel notch filter in series???

25th August 2006, 01:12 PM	#2
badman Custom Title diyAudio Member Join Date: Sep 2003 Location: Sunny Tustin, SoCal	Yes, if you wanted to have a 15dB notch filter, you could do 5 in series, but they wouldn't simply sum the way you're hoping. Better is to notch it out line level, for such a dramatic notch. This will take some calculation (or a high-resolution equalizer). If you must do it speaker level, you would probably have to do a multiple component filter. __________________ I write for www.enjoythemusic.com in the DIY section. You may find yourself getting a preview of a project in-progress. Be warned!

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25th August 2006, 05:09 PM	#3
Mikael Abdellah diyAudio Member Join Date: Jan 2003 Location: Sweden	I was afraid/hoping an active crossover would be the best way. I will try to find some information and formulas on the subject.

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