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Old 22nd November 2011, 09:37 AM   #1
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Default notch filter

not baffle step.

3,200hz = .125mFd + 20uF + maybe 6-12ohms (all three in parallel), then series the network with the driver.

I found a post over at by Tomservo.
I crunched the numbers and sure enough, it is 3,200hz.
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Old 22nd November 2011, 10:21 AM   #2
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Hi Norman, I assume that .125mFd was actually 0.125mH

This wikipedia article I found invaluable for doing notch filters. RLC circuit - Wikipedia, the free encyclopedia

something that is useful is that you can play with the values of the C and L to get different Q's but still keep the same centre frequency.

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Old 22nd November 2011, 10:58 AM   #3
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lol, yup. mH............

Found a Z-plot by freddi (betsyk ?).
Enclosure designs for Burro Speakers

a 9ohm resistor should knock peak down by 6db (you can see a slight wrinkle there).

You are right on the Q of the notch. If I remember, the values get really large (expensive) as the notch gets narrower.

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