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-   -   notch filter (http://www.diyaudio.com/forums/wild-burro-audio/200986-notch-filter.html)

norman bates 22nd November 2011 09:37 AM

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 audioasylum.com by Tomservo.
I crunched the numbers and sure enough, it is 3,200hz.
High Efficiency Speaker Asylum


Norman

wintermute 22nd November 2011 10:21 AM

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.

Tony.

norman bates 22nd November 2011 10:58 AM

lol, yup. mH............ :nod:

Found a Z-plot by freddi (betsyk ?).
http://www.diyaudio.com/forums/wild-...peakers-2.html

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.

Norman


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