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 21st January 2020, 02:34 PM   #831
limacon is offline limacon  United Kingdom
diyAudio Member
 
Join Date: Oct 2019
A few db bump at the desired spot that was flatter on the previous version.
Acoustic Horn Design The Easy Way (Ath4)

306 x 238 mm

What do you think? Worth a try?

Code:
  ThroatDiameter = 36                   ; [mm]
  ThroatAngle = 29                      ; [deg]
  Coverage_Horizontal = 88              ; [deg]
  Coverage_Vertical = 66                ; [deg]
  Depth = 100                           ; [mm]
  SE_s = 1.9
  SE_n = 3.0
  SE_q = 0.995  
  Depth.ConicSectionPart = 0.8         
  Shape = raw2rect  
  Shape.FixedPart = 0.2              
  Shape.CornerRadius = 35.0             ; [mm]
  SEExp = 2.5                           ; superellipse exponent
  ABEC.f1 = 500                              ; [Hz]
  ABEC.f2 = 18000                            ; [Hz]
  ABEC.NumFrequencies = 31
Attached Images
File Type: png hf146 v2.png (56.2 KB, 253 views)
File Type: png hf146 v2 polar.png (72.6 KB, 254 views)

Last edited by limacon; 21st January 2020 at 02:39 PM.
  Reply With Quote
Old 21st January 2020, 02:49 PM   #832
mabat is offline mabat  Czech Republic
diyAudio Member
 
mabat's Avatar
 
Join Date: Sep 2004
Location: Prague
Is this it? I don't know, the fact is that it is very smooth but it doesn't hold the pattern as good - it depends.

But I think you still don't have the measurement right. That would be my first concern.
Attached Images
File Type: png lima-0.PNG (136.0 KB, 258 views)
File Type: png lima-1.PNG (39.1 KB, 256 views)
File Type: png lima-2.PNG (53.1 KB, 255 views)
__________________
www.at-horns.eu
  Reply With Quote
Old 21st January 2020, 02:54 PM   #833
mabat is offline mabat  Czech Republic
diyAudio Member
 
mabat's Avatar
 
Join Date: Sep 2004
Location: Prague
Quote:
Originally Posted by limacon View Post
306 x 238 mm
When I try your parameters, I get 288 x 218 mm.
__________________
www.at-horns.eu
  Reply With Quote
Old 21st January 2020, 03:21 PM   #834
limacon is offline limacon  United Kingdom
diyAudio Member
 
Join Date: Oct 2019
Quote:
Originally Posted by mabat View Post
When I try your parameters, I get 288 x 218 mm.
Ahh, changed to 0.995 - you're right.
  Reply With Quote
Old 21st January 2020, 04:35 PM   #835
gedlee is online now gedlee  United States
diyAudio Member
 
gedlee's Avatar
 
Join Date: Dec 2004
Location: Novi, Michigan
An unbaffled waveguide will show substantial differences from an enclose one (including infinite baffle.) I suspect that this is the issue between sims and reality. I have always said that open baffle is a really bad idea for a waveguide as the edge termination will cause diffraction even when there is a smoothed mouth termination.

These details are why we need to see more sim versus reality to find where the sim limitations come into play. At higher freqs there will be issues with the driver not supplying an ideal wavefront and at the lower freqs we will see differences due to baffling. This can be large or small, but need to be understood.

Clearly, I think, we can see that not baffling the waveguide is bad idea. More data and we might see some more issues that need resolution.
__________________
Earl Geddes Gedlee Website
  Reply With Quote
Old 21st January 2020, 10:39 PM   #836
Patrick Bateman is offline Patrick Bateman  United States
diyAudio Member
 
Patrick Bateman's Avatar
 
Join Date: Oct 2006
Location: San Diego
Quote:
Originally Posted by gedlee View Post
An unbaffled waveguide will show substantial differences from an enclose one (including infinite baffle.) I suspect that this is the issue between sims and reality. I have always said that open baffle is a really bad idea for a waveguide as the edge termination will cause diffraction even when there is a smoothed mouth termination.

These details are why we need to see more sim versus reality to find where the sim limitations come into play. At higher freqs there will be issues with the driver not supplying an ideal wavefront and at the lower freqs we will see differences due to baffling. This can be large or small, but need to be understood.

Clearly, I think, we can see that not baffling the waveguide is bad idea. More data and we might see some more issues that need resolution.
Here's some data if anyone's curious:

Click the image to open in full size.

21" x 8.4" ATH4 waveguide mounted on 28" x 28" baffle

Click the image to open in full size.

same waveguide, no baffle

Click the image to open in full size.

predicted response

Note: the first measurement goes from 0 to 55, the second goes from 0 to 44, and the last goes from 0 to 56
  Reply With Quote
Old 22nd January 2020, 06:24 AM   #837
mabat is offline mabat  Czech Republic
diyAudio Member
 
mabat's Avatar
 
Join Date: Sep 2004
Location: Prague
It is very nice with the baffle on. Is it a diffraction from the baffle edge at 700 Hz?

(Just could you please post the pictures a bit smaller? It may be bothersome to read the page when they don't fit...)
__________________
www.at-horns.eu

Last edited by mabat; 22nd January 2020 at 06:27 AM.
  Reply With Quote
Old 22nd January 2020, 06:57 AM   #838
Ro808 is online now Ro808  Netherlands
diyAudio Member
 
Join Date: Mar 2010
Quote:
Originally Posted by mabat View Post
Just out of curiosity - I expected it even worse.
(54 x 22 x 16 cm = W x H x D)
Makes me wonder what the sim of a 50 x 35 x 20 cm with 1.4" entrance would look like.

Last edited by Ro808; 22nd January 2020 at 07:04 AM.
  Reply With Quote
Old 22nd January 2020, 07:06 AM   #839
mabat is offline mabat  Czech Republic
diyAudio Member
 
mabat's Avatar
 
Join Date: Sep 2004
Location: Prague
You are free to try: Acoustic Horn Design – The Easy Way (Ath4)
(it was 1.4")
__________________
www.at-horns.eu
  Reply With Quote
Old 22nd January 2020, 09:29 AM   #840
pelanj is offline pelanj  Czech Republic
diyAudio Member
 
Join Date: Jul 2008
I wonder what would be the results if I wanted to design an 80 waveguide for 12" coaxial speaker (like Danley SM80) and what would the sims look like. I need to try that
  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 10:47 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki