Notch filter

godless · 20th April 2008, 04:32 PM

What exactly is the "notch filter" that B&G is talking about when they refer to the specs of their RD line of transducers?

Thanks!

Cal Weldon · 20th April 2008, 06:13 PM

Do you want to know about that particular one or just what a notch filter is?

jperkin2 · 20th April 2008, 07:44 PM

A notch filter is just the opposite of a band-pass filter. A band-pass filter would pass a certain range of frequencies (all the frequencies inside the band), while it would cut out all the others. A notch filter cuts out a certain band of frequencies (all the frequencies inside the notch) and passes everything else.

godless · 20th April 2008, 08:44 PM

Quote:

Originally posted by jperkin2
A notch filter is just the opposite of a band-pass filter. A band-pass filter would pass a certain range of frequencies (all the frequencies inside the band), while it would cut out all the others. A notch filter cuts out a certain band of frequencies (all the frequencies inside the notch) and passes everything else.

I see, do you happen to know which frequencies BG is cutting out with the notch filter they are using in the RD40?

jperkin2 · 22nd April 2008, 08:00 AM

No, sorry.

kstrain · 22nd April 2008, 09:26 AM

The RD series drivers should be used with a notch filter which equalizes a natural frontal cavity resonance.This peak is pronounced in the 5 kHz area on-axis, with a diminishing peak further off-axis.

Sounds undesirable.

Ken

google bg rd40 notch filter

20th April 2008, 04:32 PM	#1
godless diyAudio Member Join Date: Aug 2005	Notch filter What exactly is the "notch filter" that B&G is talking about when they refer to the specs of their RD line of transducers? Thanks!

20th April 2008, 06:13 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Do you want to know about that particular one or just what a notch filter is? __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

22nd April 2008, 09:26 AM	#6
kstrain diyAudio Member Join Date: Apr 2006 Location: Glasgow	from BG data sheet The RD series drivers should be used with a notch filter which equalizes a natural frontal cavity resonance.This peak is pronounced in the 5 kHz area on-axis, with a diminishing peak further off-axis. Sounds undesirable. Ken google bg rd40 notch filter

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20th April 2008, 07:44 PM	#3
jperkin2 diyAudio Member Join Date: Apr 2008	A notch filter is just the opposite of a band-pass filter. A band-pass filter would pass a certain range of frequencies (all the frequencies inside the band), while it would cut out all the others. A notch filter cuts out a certain band of frequencies (all the frequencies inside the notch) and passes everything else.

22nd April 2008, 08:00 AM	#5
jperkin2 diyAudio Member Join Date: Apr 2008	No, sorry.

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