notch filter

norman bates · 22nd November 2011, 09:37 AM

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............

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.

Norman

22nd November 2011, 09:37 AM	#1
norman bates diyAudio Member Join Date: Nov 2003 Location: iowa	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

22nd November 2011, 10:21 AM	#2
wintermute just another diyAudio Moderator Join Date: Aug 2003 Location: Sydney Blog Entries: 22	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. __________________ Any intelligence I may appear to have is purely artificial! Some of my photos

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22nd November 2011, 10:58 AM	#3
norman bates diyAudio Member Join Date: Nov 2003 Location: iowa	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. Norman