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

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 20th September 2019, 05:48 PM   #221
mabat is offline mabat  Czech Republic
diyAudio Member
 
mabat's Avatar
 
Join Date: Sep 2004
Location: Prague
A few pictures will tell more than a thousand words, I only have to code it first. Then I will show better what I mean.

Quote:
Originally Posted by gedlee View Post
Don't the two curves have to match slope, not curvature? With slope only A works.
Actually it is easy to match both. The slope is allways matched by simply rotating the clothoid - it doesn't matter where it starts. Curvature increases linearly along its length so it's all about finding the right point.
Attached Images
File Type: png h-c.png (12.4 KB, 286 views)
  Reply With Quote
Old 20th September 2019, 06:37 PM   #222
gedlee is offline gedlee  United States
diyAudio Member
 
gedlee's Avatar
 
Join Date: Dec 2004
Location: Novi, Michigan
Point "B", still seems wrong to me.
__________________
Earl Geddes Gedlee Website
  Reply With Quote
Old 22nd September 2019, 06:38 AM   #223
norman bates is offline norman bates  United States
diyAudio Member
 
norman bates's Avatar
 
Join Date: Nov 2003
Location: iowa
Mabat,

In post 212, you show a poorly terminated os (your pic below).

Is that poorly terminated because of the last bend to the mouth (baffle) ?


If so, what would a good os look like ?

I though os was conical, but with a rounded throat, then a round over at the mouth.
Couldn't tell you how fast it opens, just better dispersion for a wider mouth to distance to throat.

How to Reduce Diffraction on Your Conical Horn
Attached Images
File Type: png OSWG-2.png (123.8 KB, 239 views)

Last edited by norman bates; 22nd September 2019 at 06:42 AM.
  Reply With Quote
Old 22nd September 2019, 06:34 PM   #224
mabat is offline mabat  Czech Republic
diyAudio Member
 
mabat's Avatar
 
Join Date: Sep 2004
Location: Prague
Quote:
Originally Posted by norman bates View Post
Is that poorly terminated because of the last bend to the mouth (baffle) ?
Yes, it's too small, too abrupt.

OS is not a cone with a rounded throat. It's hyperbola from the throat to infinity. Mouth termination is not part of OS and should be as smooth/gradual as possible - at least this is obvious from the calculations so far. It's a continuum, there's no dividing line between right and wrong, however.
  Reply With Quote
Old 22nd September 2019, 06:38 PM   #225
mabat is offline mabat  Czech Republic
diyAudio Member
 
mabat's Avatar
 
Join Date: Sep 2004
Location: Prague
I've finally managed to figure out the one-describe-it-all equation, from throat to mouth.

Not there yet, but close...
(Black line is an OS connected to a clothoid, orange line is the new equation.)
Attached Images
File Type: png one-eq-profile.png (17.0 KB, 206 views)
File Type: png batik_eq0.png (1.6 KB, 207 views)
  Reply With Quote
Old 22nd September 2019, 06:56 PM   #226
mabat is offline mabat  Czech Republic
diyAudio Member
 
mabat's Avatar
 
Join Date: Sep 2004
Location: Prague
Closer still...

Not much of use I guess, but it's nice.
Attached Images
File Type: png one-eq-profile-2.png (16.3 KB, 203 views)

Last edited by mabat; 22nd September 2019 at 06:58 PM.
  Reply With Quote
Old 22nd September 2019, 07:07 PM   #227
norman bates is offline norman bates  United States
diyAudio Member
 
norman bates's Avatar
 
Join Date: Nov 2003
Location: iowa
Ahhhhhh, thank you.

That makes sense.

Many os ive seen seem to have that last soft corner (mouth break ?).
I'd figured it was a place that could be improved.

Tricky where to deviate from conical, and how fast to do it.
Even my 2384 has a bit of bend in the path before the last mouth round over.
I bet it helps (conical slight bending).

Again, thank you.
  Reply With Quote
Old 22nd September 2019, 07:25 PM   #228
gedlee is offline gedlee  United States
diyAudio Member
 
gedlee's Avatar
 
Join Date: Dec 2004
Location: Novi, Michigan
Quote:
Originally Posted by mabat View Post
I've finally managed to figure out the one-describe-it-all equation, from throat to mouth.

Not there yet, but close...
(Black line is an OS connected to a clothoid, orange line is the new equation.)
That is exactly the kind of equation that I had in mind when I mentioned this before. Nice work.
__________________
Earl Geddes Gedlee Website
  Reply With Quote
Old 22nd September 2019, 07:34 PM   #229
mabat is offline mabat  Czech Republic
diyAudio Member
 
mabat's Avatar
 
Join Date: Sep 2004
Location: Prague
Yep, I know, thanks. I only have no idea how to calculate all the parameters based on desired horn dimensions. Right now it's only fitted to a particular sample - just a quick excercise. I also felt there must be an equation like this, maybe this is not even the best one...


Oh, and it actually should go like this -
Attached Images
File Type: png bathorn-eq0-1.png (3.1 KB, 78 views)

Last edited by mabat; 22nd September 2019 at 07:50 PM.
  Reply With Quote
Old 22nd September 2019, 08:02 PM   #230
gedlee is offline gedlee  United States
diyAudio Member
 
gedlee's Avatar
 
Join Date: Dec 2004
Location: Novi, Michigan
Now that I think of it, it would have to be a two part equation. The first pure OS and then the OS plus equation, right? The joining point and the total length would set the values of the parameters.
__________________
Earl Geddes Gedlee Website
  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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Easy horn (Eazy Horn) still work? Alternatives? Soldermizer Subwoofers 2 4th March 2014 05:01 PM
For sale: Sound easy V18 & Acoustic-dimension stepped attenuator Tazzz Swap Meet 8 3rd November 2012 08:00 AM
easy exponential horn speakers anyone? 12345chris Full Range 9 21st March 2012 11:32 AM
Easy horn, quadrant horn? Hentai Multi-Way 2 29th January 2012 08:50 AM
An easy to build classic horn? dabbler Multi-Way 22 1st September 2011 08:01 AM


New To Site? Need Help?

All times are GMT. The time now is 05:40 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki