Need a notch filter calculator. - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 17th July 2006, 02:35 AM   #1
diyAudio Member
 
GuyPanico's Avatar
 
Join Date: Mar 2005
Location: Euless, TX
Default Need a notch filter calculator.

Are there any notch filter calculators? I'd like to tame the mountain at 7khz I have. The calculator I did find will only attenuate the peak -3db. I need more like -6db however.
  Reply With Quote
Old 17th July 2006, 02:44 AM   #2
jamikl is offline jamikl  Australia
diyAudio Member
 
Join Date: May 2005
Location: Melbourne
There is an Excel one available called notchcalc. Can't remember where I got it from. Displays the depth and the width of what you calculate on the sheet. This may help. Googling under that name mya find it.
jamikl
  Reply With Quote
Old 17th July 2006, 02:46 AM   #3
jamikl is offline jamikl  Australia
diyAudio Member
 
Join Date: May 2005
Location: Melbourne
users.d-web.com/dbrown/speakers/speakers_files/notchcalc.xls
jamikl
  Reply With Quote
Old 17th July 2006, 03:24 AM   #4
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
a notch filter is a "band reject filter" -- sort of like a the hole in a donut -- you sum a high pass and low pass filter -- use resistors to lower the Q -- it can be done with passive devices if you have a lot of patience.

best to get a CAD program like SwitcherCad (free from linear tech) and play around with the RLC values.

you can also make some valiant assumptions with respect to the input impedance of the amplifier and use an RC notch filter, or just fix the input value of the amplifier with a resistor and plug and play.

an active notch filter can have the Q continuously adjusted. most often people use active notch filters in applications like hum removal or to notch out the fundamental frequency for analysis of distortion residuals.
  Reply With Quote
Old 17th July 2006, 02:47 PM   #5
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
I like to use this one

http://www.mhsoft.nl/spk_calc.asp
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
need help wana change 60-Hz twin-T notch filter to 279 Hz filter prorms Solid State 0 9th February 2008 11:38 PM
Can Zaphs notch filter be used without the BSC filter? GuyPanico Full Range 0 21st July 2007 01:27 AM
fe 103 notch filter Jhovis Full Range 6 16th April 2007 09:43 PM
Notch filter qguy Multi-Way 3 26th October 2006 09:26 PM
Series Filter Calculator Lars Clausen Multi-Way 10 17th November 2005 03:13 AM


New To Site? Need Help?

All times are GMT. The time now is 10:49 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2