Linear phase active x-overs? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 17th May 2002, 10:29 AM   #1
diyAudio Member
Join Date: Apr 2002
Default Linear phase active x-overs?

I have been looking into building a crossover that has phase that is the same for all frequencies. I considered the Linkwitz-Riley activer filter (2-way, 24dB/oct) but recently i read a post that says it is phase coherent at the x-over frequency and not linear phase. If i have it right it means that the phase will differ at some frequencies and not be "in phase" the whole time. If so which active filters can you use for linear phase?
And how do subtractive filters work?
  Reply With Quote
Old 17th May 2002, 10:54 AM   #2
sonnya is online now sonnya  Denmark
diyAudio Member
sonnya's Avatar
Join Date: Oct 2001
Location: Denmark
For active X-over look at filtercad from

There you can look at phase response, delay, frequency sweep, and pulseresponse for different types of filters.

  Reply With Quote
Old 17th May 2002, 04:42 PM   #3
Join Date: Feb 2002
Location: As far from the NOSsers as possible
Default What's wrong with L-R filters?

If you haven't tried them, I suggest you do. And they work great in a bi-amp setup.

  Reply With Quote
Old 17th May 2002, 08:08 PM   #4
The one and only
Nelson Pass's Avatar
Join Date: Mar 2001
You can see a discussion of "subtractive" filters in
my Phase Coherent Crossover article, currently posted
  Reply With Quote
Old 17th May 2002, 11:10 PM   #5
diyAudio Member
peranders's Avatar
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
There are no such things as linear phase filters, if they are analogue but if you make them digital, then you can make them linear (constant delay). Filters are a complicated subject but am I right?

BTW: Mr. Pass' filters looks nice!
/Per-Anders (my first name) or P-A as my friends call me
PA03 LM4780 amplifier group buy, SIGN UP HERE 41 boards so far.
  Reply With Quote
Old 18th May 2002, 12:51 AM   #6
Join Date: Feb 2002
Location: Dallas,Texas
Smile There are no such things as linear phase filters

No.... You are not right.
  Reply With Quote


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
Can we talk active x-overs? zimjj Multi-Way 37 6th September 2009 11:57 PM
Active vs. Passive X-overs Pete H Multi-Way 60 7th June 2005 05:08 PM
Active crossover with linear phase response ackcheng Solid State 1 20th July 2004 06:54 AM

New To Site? Need Help?

All times are GMT. The time now is 10:37 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright ©1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2