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Old 20th April 2008, 04:32 PM   #1
godless is offline godless  United States
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Default 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!
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Old 20th April 2008, 06:13 PM   #2
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Do you want to know about that particular one or just what a notch filter is?
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Old 20th April 2008, 07:44 PM   #3
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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.
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Old 20th April 2008, 08:44 PM   #4
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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?
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Old 22nd April 2008, 08:00 AM   #5
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No, sorry.
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Old 22nd April 2008, 09:26 AM   #6
kstrain is offline kstrain  Scotland
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Default 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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