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

How do I match a woofer and tweeter?
How do I match a woofer and tweeter?
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 3rd August 2009, 11:39 PM   #1
chasingame is offline chasingame  United States
diyAudio Member
Join Date: Jul 2009
Default How do I match a woofer and tweeter?

Suppose I have studied the resonant freq on tweeter and I find one with appropriate frequency range to match with a woofer in a two-way, then I study the SPL and notice they are different.

I have a project. My two woofers are 86 spl. I plan to use two in parallel. I think I have read that this can boost the spl by 3db.

so my duo then may appear as an 89 spl.

My tweeter is 90spl.

If I install a Baffle compensation circuit and drop the woofer output by 3db, this puts me back at 86 vs 90.

Do I want the tweeter "bright" ? Or should I theoretically go for matched spl and put in an L-Pad to lower the tweeter by 3db ?

Also, if I do not use a zobel on the woofer, I do not quite understand the affect on the midrange as the impedence rises in the area of the XO.

My desired XO point is 3500. I am using some small mid woofers that have usable freq in that range. I plan to use a 2nd order design.

The point of this thread is to understand matching the woofer and tweeter in terms of loudness. I had hoped to focus on this issue.
  Reply With Quote
Old 4th August 2009, 01:25 AM   #2
Shaun is offline Shaun  South Africa
diyAudio Member
Shaun's Avatar
Join Date: Aug 2001
Location: Cape Town, South Africa
Hi Anthony

The two woofers in parallel give +6dB. Use the Baffle Diffraction Simulator (BDS) or Edge to guage the final response of your drivers. Usually the tweeter is most sensitive, and needs to be attenuated (a.k.a. "padding"). If you apply full baffle step correction you will lose 6dB sensitivity, though this much compensation is only recommended if your speakers will be free-standing. 4-3 dB is a good compromise in small rooms and/or placement close to the wall.

Impedance peaks can complicate crossover design, but one does not always need to use zobel or similar impedance compensation. This is dependent on the specific design.

Finally, if you can manage, try and get hold of a mic for measuring FR of the drivers in situ. Speaker Workshop is free software that allows you to do a start-to-end CAD design.

Shaun Onverwacht
|||||||||| DON'T PANIC ||||||||||
  Reply With Quote
Old 4th August 2009, 02:57 AM   #3
ZilchLab is offline ZilchLab  United States
Join Date: Jan 2008
  Reply With Quote
Old 6th August 2009, 08:35 PM   #4
Inductor is offline Inductor  Portugal
diyAudio Member
Inductor's Avatar
Join Date: Feb 2006
Location: Cascais
From your post you need a good loudness matching at crossover freq. and some people give more importance to speakers being in phase also. So consider R for both at that xover freq. 3K/3.5K for the 2order filter and/plus attenuation of 4dB for the tweeter (if from 90dB > 86dB as you said).
  Reply With Quote


How do I match a woofer and tweeter?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Woofer adivce to match my tweeters IG81 Multi-Way 19 16th April 2009 06:37 PM
Woofer/Tweeter match Mjr7531 Multi-Way 5 6th April 2005 12:47 AM
i need woofer to match jx92s in jakarta _henry_ Swap Meet 2 4th September 2004 05:36 PM
Should woofer material match driver mat. BROKEN THIRDS Multi-Way 0 19th April 2004 05:43 PM
Should Woofer material match drivers BROKEN THIRDS Introductions 2 19th April 2004 02:54 PM

New To Site? Need Help?

All times are GMT. The time now is 05:50 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio