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-   -   Acoustic Horn Design The Easy Way (Ath4) (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4.html)

mabat 12th July 2019 05:45 AM

Quote:

Originally Posted by Hylle (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post5848656.html#post5848656)
When you talk exit angle on a compressiondriver, how is that defined?

Usually there is some length of a conical section at the very end of a driver exit, so this cone opening angle is meant by that - the horn should then just match smoothly. There are exceptions.

mabat 12th July 2019 05:56 AM

Quote:

Originally Posted by Gaga (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post5848541.html#post5848541)
... I'd appreciate to get a *.step-file as well, which would ease up the transfer to a CAD program to finally print the horn. Any possibility?

Hi Christoph,

that's not at all easy. To get a STEP or IGES file I would have to use some surface splines (NURBS) to get the same results as I have now and I'm not sure I'm willing to do that. I agree that STL is probably not really the best option but it's all I have for now - it's just very easy to do. I could make the STL as a volume instead of just a sheet - that may ease the processing, I don't know. But as I understand, there are ways to do that in CADs.

I will add an option of a "point cloud" output. That may also help some.

mabat 12th July 2019 06:02 AM

Quote:

Originally Posted by carlthess40 (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post5848813.html#post5848813)
Can this program be use to make full range wood horns? Or mid/high wood horns?

You would have to explain what do you mean by that. The program uses some basic set of parameters to get a horn. It depends on your needs if this is sufficient or not. Basically you can combine hyperbola and a clothoid in various ways along the contour, in any dimensions you like.

mabat 12th July 2019 10:42 AM

I thought about the dome tweeters. The biggest problem I see might be that the real dome (especially a soft one) will not move coherently as a one body at the higher frequencies where the simulation would be the most interesting. I will probably implement it, as it is not difficult, but I would be hesistant to make much of it. Maybe for hard domes it will give more reliable results. But hey, it's similar to compression drivers flat wavefront assumption.

danibosn 12th July 2019 02:28 PM

1 Attachment(s)
Hi guys

I know that you are already couple of steps forward but need some help with ath4 application.
I followed instructions, extract ath4, copy in same directory gmsh-4.3.dll, made cmd shortcut and copy file path in "start in". When I double click cmd shortcut nothing happen, actually new cmd window blink for a second and disappear. I rename ath4 to ath4.exe and tried again, same thing.
After that I've tried to go regular procedure: open cmd, type cd (file path), enter, type start and application name (both ath4 and ath4.exe) and same thing happens.
After first fail I deleted all files and download and repeat everything again on two computers with same results.
So please is there any known solution ...

mabat 12th July 2019 02:45 PM

Don't type "start ath4", just "ath4".

There is a chapter "3. Working example" in the user guide. Please go step by step as shown. You will also need to change the output directory in the script file(s): Out.DestDir = "..."
http://www.at-horns.eu/release/Ath4_UserGuide.pdf

1hiep0 12th July 2019 03:25 PM

Hi,
I see that you could view .stl but could it be used to modify? Would be nice.
Thanks,

danibosn 15th July 2019 04:30 PM

Thank' Marcel

of course it was about me, after follow manual and your advice's everything working fine

mabat 16th July 2019 06:32 AM

BTW, an interesting driver for home use seems to be the new Celestion CDV1-1757.
CDV1-1757 - Vocal Range Compression Driver

Patrick Bateman 16th July 2019 06:48 AM

Quote:

Originally Posted by mabat (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post5849570.html#post5849570)
I thought about the dome tweeters. The biggest problem I see might be that the real dome (especially a soft one) will not move coherently as a one body at the higher frequencies where the simulation would be the most interesting. I will probably implement it, as it is not difficult, but I would be hesistant to make much of it. Maybe for hard domes it will give more reliable results. But hey, it's similar to compression drivers flat wavefront assumption.

Hi Marcel,

I've found that 3/4" dome tweeters work really nicely on horns and waveguides. The SB Acoustics SB19 works on virtually every waveguide I've come across.

I agree that a lot of dome tweeters are useless on horns and waveguides, but there are a handful that work nicely.


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