Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

Help with notch filter
Help with notch filter
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
Thread Tools Search this Thread
Old 11th June 2003, 02:21 PM   #1
nobody special is offline nobody special  United States
diyAudio Member
nobody special's Avatar
Join Date: Oct 2002
Location: USA
Default Help with notch filter

I have an idea for a crossover design, but I am having trouble finding info on how to calculate the notch filter I need. I can't find my copy of the Loudspeaker Design cookbook, so I am asking for some help here.
I have a woofer that has a fairly smooth frequency response and a nice, predictable rolloff, with the exception of a peak (cone breakup mode, I presume) at 3250 Hz. The peak is about 6 db, and is fairly narrow. I need the information on how to calculate a notch filter to reduce this peak. Also, please specify whether the filter has the RCL in series, paralleled with the woofer, or if it has the RCL in parallel- inline with the woofer.
My goal is to reduce this peak and then use the natural rolloff of the woofer to crossover @12db/octave to a tweeter at around 4600Hz. If the filter is a little too broad, that isn't too big of a deal, because the tweeter has a couple db lift around the 3000-4000 range that would complement it.
It is kind of interesting- the woofer is almost exactly 180 degrees out of phase right where it is down 6db, and it's rolloff is almost exactly 12db/octave, maybe a little shallower- closer to 10/11db. It looks like a really easy and simple crossover using a second order high pass on the tweeter. I just have to get rid of that peak! I hope it works as well in practice as in theory (does that ever happen?).
Anyway, if you guys can help me out with the notch filter info, I would really appreciate it!.
  Reply With Quote
Old 11th June 2003, 03:06 PM   #2
filippo22 is offline filippo22
diyAudio Member
Join Date: Jul 2001
Location: Italy

here you can find a good on-line calculator


  Reply With Quote


Help with notch filterHide 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

Forum Jump

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 10th February 2008 12:38 AM
notch filter help omni Multi-Way 14 23rd July 2007 02:11 AM
Can Zaphs notch filter be used without the BSC filter? GuyPanico Full Range 0 21st July 2007 02:27 AM
Notch filter qguy Multi-Way 3 26th October 2006 10:26 PM
Do I Need A Notch Filter? noodle_snacks Multi-Way 13 31st October 2005 02:35 PM

New To Site? Need Help?

All times are GMT. The time now is 03:06 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio