Crossover suggestions? - 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 25th January 2006, 05:58 PM   #1
diyAudio Member
 
Join Date: Jan 2006
Location: Winnipeg
Default Crossover suggestions?

3 way system. 41 litre enclosure for the woofer. 1 litre enclosure for the mid. Sealed. Using old boxes - solid walnut sides (I think its walnut) and MDF front and back.
Woofer - Vifa PL26WR09-08
Mid - Audax AM100Z0
Tweeter - Visaton G25ND
Specs are attached

Another couple of things. Current speakers have 1/2 " recessed front baffle. Should this be changed. I could laminate MDF into the recess.
Attached Files
File Type: pdf speakerspecs.pdf (7.8 KB, 73 views)
  Reply With Quote
Old 26th January 2006, 03:25 AM   #2
tade is offline tade  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Ralieigh nc
Send a message via AIM to tade
Warning, N008 advice:

I might fill the recess with felt or some sort of open celled foam and then cover with grille cloth for pretty.

As for crossovers, I really like active because if you can get enough amp channels the electronics become very cheap. and thus experimentation becomes cheap. It will cost me less than ten dollars to change the crossover frequency, or to compensate for baffle step, or to extend bass response. I like that flexibility. I would say that limiting the amp's duty range frees it up to sound better as wel...

good luck!
  Reply With Quote
Old 26th January 2006, 03:31 PM   #3
diyAudio Member
 
Join Date: Jan 2006
Location: Winnipeg
Thanks for advise on recess. I am using these boxes until summer when I can build some new ones outside (as soon as the snow melts - wife would kill me for building them in her new basement).
As for crossovers - I do have a friend who rebuilt his Mirage OM8 crossovers and gave me his old ones. They may work or not. He works for an electronics store so building new passive crossovers will not be a cost problem. Just looking for suggestions on what type of crossover to build.
  Reply With Quote
Old 10th February 2006, 03:58 PM   #4
diyAudio Member
 
Join Date: Jan 2006
Location: Winnipeg
Default first crossover design

Here is my attempt at designing a crossover for the drivers above. Any comments would be greatly appreciated.
Attached Images
File Type: jpg sch.jpg (17.2 KB, 325 views)
  Reply With Quote
Old 10th February 2006, 05:45 PM   #5
thalis is offline thalis  Greece
diyAudio Member
 
Join Date: Jan 2004
Location: Athens
It’s difficult to decide without having modeled driver curves-phases. It looks a good start. I believe the upper cross freq. will be at about 2K which is perhaps too low for the tweeter – 3K would be better. Phase should probably look ok, and impedance would look relatively smooth as well.
Regards,
Thalis
  Reply With Quote
Old 10th February 2006, 05:56 PM   #6
diyAudio Member
 
Join Date: Jan 2006
Location: Winnipeg
Default Tweeter

Tweeter specs
Attached Images
File Type: gif tweeter.gif (8.9 KB, 250 views)
  Reply With Quote
Old 10th February 2006, 05:59 PM   #7
diyAudio Member
 
Join Date: Jan 2006
Location: Winnipeg
Default Audax Mid

Mid
Attached Images
File Type: jpg audax.jpg (91.1 KB, 269 views)
  Reply With Quote
Old 10th February 2006, 06:12 PM   #8
diyAudio Member
 
Join Date: Jan 2006
Location: Winnipeg
Default Woofer

Woofer
http://www.tymphany.com/datasheet/printview.php?id=130
  Reply With Quote
Old 11th February 2006, 01:21 AM   #9
thalis is offline thalis  Greece
diyAudio Member
 
Join Date: Jan 2004
Location: Athens
I did a quick model of these drivers. It’s not precise: The real boxes and baffles are evidently not modeled. Drivers are modeled in the same vertical plane, mid acoustical center 1cm behind the tweeter and woofer 2,5 cm behind. Midrange is modeled in a big closed enclosure (>6 litter), Woofer’s model doesn’t matter significantly for these crossover points. I also decreased a little some cone breakups since they will get somewhat smoothed in a real enclosure.
SPL magnitude of the circuitry looks like this:

Click the image to open in full size.

Imp magnitude:

Click the image to open in full size.

If woofer and tweeter are positively connected and the mid inverted, SPl mag will look like this:

Click the image to open in full size.

I changed a little some values in your circuitry:

Click the image to open in full size.

I worked things out for some baffle correction, making some assumptions regarding your baffle according to the volume you stated. So, in the next frequency responses you should consider that beyond 400-500 Hz the real loudspeaker output will be less, hopefully at about the same order with the rest frequencies (if baffle step, woofers placement and room gain come into the equation together).
So, here is the SPL mag:

Click the image to open in full size.

And impedance will be like this:

Click the image to open in full size.

I also worked a slightly different circuitry, adding 2 values:

Click the image to open in full size.

With these you get this SPL response

Click the image to open in full size.

and this impedance curve

Click the image to open in full size.

Normaly, these two are a good starting point. In reality you shouldn’t get considerably different responses. Nevertheless you should work your enclosures, measure your drivers in them, and then some improvements could be made.
Regards,
Thalis
  Reply With Quote
Old 13th February 2006, 07:30 PM   #10
diyAudio Member
 
Join Date: Jan 2006
Location: Winnipeg
Sorry for newbie response

What does the 1% on schematics mean - is this tolerance?
Also you state that the mid was modelled in a 6L enclosure. I have a 1L (or 1.25L) bullet shaped enclosure from SEAS.

As stated before I am going to drop in the drivers in old 41L boxes and build a new enclosures this summer. Does the mid enclosure need to be this big.

All in all - do you suggest I build crossover according to your second proposal.
  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
low-pass crossover suggestions Telstar Multi-Way 24 18th November 2008 11:34 AM
<AUS> B3S active crossover design - Value woofer suggestions? TheSeekerr Multi-Way 0 25th August 2008 12:46 PM
Generic Sub Crossover Suggestions? Dominick22 Subwoofers 9 16th October 2006 11:38 AM
Suggestions on my crossover design? JoeyDD Multi-Way 11 11th December 2005 02:05 PM


New To Site? Need Help?

All times are GMT. The time now is 05:27 PM.


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