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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)

JSS 22nd February 2021 11:50 PM

1 Attachment(s)
"The script Marcel made does it automatically and you end up with a body."
Are you talking about the output.stl?
I've imported that stl and converted to BREP, still could not thicken. see image
I must be missing a step.

Axissymetric horns are easy with Marcel's FusionRotaryProfile.
I'm just stuck on thickening the Tritonia.

If you have, could you share a screenshot please? thanks

mabat 23rd February 2021 07:59 AM

3 Attachment(s)
It's actually extremely simple. I will add this to the User Guide.


1) Export the slices from Ath.
Try to use as low mesh resolution as possible to preserve the shape fidelity. Fusion will interpolate splines through the mesh points.
This is what I used here:

Code:

Mesh.AngularSegments = 60
Mesh.DepthSegments = 20
Mesh.CornerSegments = 5

GridExport:f360 = {
  ExportProfiles = 0
  ExportSlices = 1
  Scale = 0.1
}

In this case this will create a file Tritonia_slices_f360.csv in the project output directory.


2) In Fusion install the Ath scripts(s):

https://www.diyaudio.com/forums/atta...1&d=1614066814


3) Run the "Ath4_SurfaceImport" script. In the "File Open Dialog" select the exported csv file.

https://www.diyaudio.com/forums/atta...1&d=1614066814


4) Add thickness to the created body (Solid - Create - Thicken):

https://www.diyaudio.com/forums/atta...1&d=1614066814

TNT 23rd February 2021 09:40 AM

... "to use as low mesh resolution" - I suppose you ment a "fine" mesh resolution to preserve....

I suppose we would look for local eruptions of GD, indicating stored and later released energy in certain frequency areas. I do understand that such aberrations might not be know to be audible but at least, we can identify areas where the WG/drivers are diverting form the ideal. If one would like, por any reason, avoid these we would have the opportunity.

//

mabat 23rd February 2021 09:46 AM

Quote:

Originally Posted by TNT (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6545421.html#post6545421)
... "to use as low mesh resolution" - I suppose you ment a "fine" mesh resolution to preserve....

Generally it's good to keep the mesh resolution as low as possible. Well it's actually a point cloud in this case, not a mesh.

I think group delay doesn't imply any stored energy (a resonance).

Vathek 23rd February 2021 10:12 AM

Quote:

Originally Posted by gedlee (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6544969.html#post6544969)
This implies that large local group delays may be more audible with level than smoother ones. I believe that this is a large part of "horn honk" that I think that we have all heard - it's perception increases with level until it sounds like nonlinear distortion - which it is not.

Shouldn't it be possible to confirm or falsify this by using a FIR filter to flatten the group delay? Whether or not using FIR filters in general is desirable or not is another story, but one should be able to do a more or less ceteris paribus A-B comparison regarding this hypothesis, no?

pelanj 23rd February 2021 10:47 AM

Yesterday I fought a bit with adding the scripts to F360. First, they are scripts and not add-ins (first confusion) and second, the folder names must be exactly the same as the script name and manifest (second onfusion) to show up in Fusion when copied to the proper directory. I would humbly suggest to rename the folders in the ATH package and add a line on how to install them. (sorry if I missed it in the docs)

TNT 23rd February 2021 12:18 PM

Quote:

Originally Posted by mabat (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6545425.html#post6545425)
Generally it's good to keep the mesh resolution as low as possible. Well it's actually a point cloud in this case, not a mesh.

I think group delay doesn't imply any stored energy (a resonance).

Just so that I understand.. a low resolution is a "course" resolution i.e. without fine details - right?

//

mabat 23rd February 2021 12:57 PM

Yes, use as coarse mesh as possible to reach the required level of shape accuracy.

newvirus2008 23rd February 2021 02:10 PM

1 Attachment(s)
Dear Mr. Marcel,

I am getting the following message (image attached) when I try running the ATH software on my computer.

If this has anything to do with the word-length (32/64 bit) of the computer, kindly share a 32-bit version of the program (if available). My operating system is 32-bit Windows Vista Home Premium.

Thanks in advance.

JSS 23rd February 2021 03:34 PM

1 Attachment(s)
Quote:

Originally Posted by mabat (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6545361.html#post6545361)
It's actually extremely simple. I will add this to the User Guide

It's working now, took only 3 minutes following your instructions.
Instead of me cursing for 3 hours :)

Thanks a lot Marcel, much appreciated!


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