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 July 2019, 09:29 AM   #121
mabat is offline mabat  Czech Republic
diyAudio Member
 
mabat's Avatar
 
Join Date: Sep 2004
Location: Prague
To all users -

I have written this several times but I will repeat as it is really crucial (for now and the current release 4.3.4):
You have to set the Out.DestDir item in your script files to some (already existing *) directory in your system. Using a full path (e.g. "D:\Acoustics\ATH_results") is the best. There will be stored your results. Otherwise the output files could be mixed up or not generated at all.

* already existing means that this directory must exist when ath4 is launched, i.e. it is not created automatically. You can create it beforehand by yourself of course

Last edited by mabat; 21st July 2019 at 09:49 AM.
  Reply With Quote
Old 21st July 2019, 10:03 AM   #122
Gaga is offline Gaga  Europe
diyAudio Member
 
Join Date: May 2005
Location: City
Hi Patrick,

Quote:
Here's what I came up with:

3D Modeling Tips and Tricks
This is great! Thanks a lot for your detailed description. I'll try to use your approach for my next sims...

Quote:
That is great, Patrick (or John). The first step, i.e. converting STL to solid, can also be easily automated. I'll definitely do that, to generate the STL as solid right away, I just have been quite busy for the last several months so not much work has been done on ath4.
I'd definitely appreciate this. Thanks again for your great work!

BW,
Christoph
  Reply With Quote
Old 21st July 2019, 05:21 PM   #123
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 mabat View Post
That is great, Patrick (or John). The first step, i.e. converting STL to solid, can also be easily automated. I'll definitely do that, to generate the STL as solid right away, I just have been quite busy for the last several months so not much work has been done on ath4.
The crazy thing, is that I could SWEAR that I was able to get meshmixer to close that waveguide. Last month in meshmixer I used some combination of settings in meshmixer, and it simply "filled in" the inside of the waveguide.

For the life of me, I couldn't get it to do that yesterday.

It's not the end of the world; extruding the shape gets the job done too, but it's messier.
  Reply With Quote
Old 20th August 2019, 10:09 AM   #124
4real is offline 4real  Netherlands
diyAudio Member
 
Join Date: May 2004
Location: Steyl
Really cool stuff this! I even managed to run it on a Mac

Did some quick and dirty experiment with a 80x40 horn:

Click the image to open in full size.
Click the image to open in full size.

One question though: is there an easy way to control the size of the horn? What I did now is tweak the depth and angles to get in the ballpark of the size I'd like, but that limits me to a specific range of angles. Let's say I want to make a 2:1 (w:h) sized horn that is 90x90 deg. Can the tool do that for me?
__________________
Do diamonds shine on the dark side of the moon?
  Reply With Quote
Old 20th August 2019, 11:46 AM   #125
mabat is offline mabat  Czech Republic
diyAudio Member
 
mabat's Avatar
 
Join Date: Sep 2004
Location: Prague
I've thought for a long time about a way how to specify the shape and the size. Finally I settled for exactly the way that you just descried - it may seem a bit odd at first but it gives you the most freedom. It could be done the other way, i.e. to set the mouth dimensions fixed and calculate the other parameters but that would mean something would need to be standardized in some way. I may re-think for the next release. Maybe I will make it an option.

BTW, you should probably increase the number of angular segments. It can be much finer than that (but the BEM analysis will take much longer).


- For anyone interested in the underlying principles of how it is really done, I can recommend the Appendix A in the User Guise. There's the math.

http://www.at-horns.eu/release/Ath4_UserGuide.pdf
  Reply With Quote
Old 20th August 2019, 11:48 AM   #126
4real is offline 4real  Netherlands
diyAudio Member
 
Join Date: May 2004
Location: Steyl
It's fine to use the trail and error method, as long as I know what knobs to turn. So how then do I go about making the horn in my last question? Or even the reverse: a (almost) square 60x40 horn?
__________________
Do diamonds shine on the dark side of the moon?
  Reply With Quote
Old 20th August 2019, 12:12 PM   #127
mabat is offline mabat  Czech Republic
diyAudio Member
 
mabat's Avatar
 
Join Date: Sep 2004
Location: Prague
That's not possible at the moment, I'm afraid, because you must enter the angles first. Together with the depth (and other variables) this will lead to some mouth dimensions. You see, when the mouth is squarish, it's strange to have the two coverage angles different, and vice versa.

I see a simple solution however. For a rectangular horn (i.e. for Shape = raw2rect), I will make parameters available for any target mouth dimensions you may like (now it is taken from the raw shape's width and height before the final transformation).

Stay tuned
  Reply With Quote
Old 20th August 2019, 12:14 PM   #128
jzagaja is offline jzagaja  Poland
diyAudio Member
 
Join Date: Jun 2004
Location: Szczecin
Do you think Abec could do phase plug sim too?
__________________
Visit us at http://www.diysoundgroup.com
The SEOS™ Project http://www.avsforum.com/t/1291022/he...-rallying-here
  Reply With Quote
Old 20th August 2019, 12:21 PM   #129
mabat is offline mabat  Czech Republic
diyAudio Member
 
mabat's Avatar
 
Join Date: Sep 2004
Location: Prague
I don't know. I don't know if the "ordinary" acouctics is all that is involved in the phase plugs. You can model that geometry down to a diaphragm, of course you can, and ABEC will calculate something (I suppose) but I have no clue about the results validity.
  Reply With Quote
Old 20th August 2019, 12:32 PM   #130
jzagaja is offline jzagaja  Poland
diyAudio Member
 
Join Date: Jun 2004
Location: Szczecin
I'm think about 3D spiral phase plug "salt shaker". Not yet finnished sketching. Looking for math formula to speed up.
__________________
Visit us at http://www.diysoundgroup.com
The SEOS™ Project http://www.avsforum.com/t/1291022/he...-rallying-here
  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 10:29 AM.


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