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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)

djmaxx 20th January 2021 09:52 AM

Years ago I was a dealer in Auto-Tech horns. I have implemented all kinds of horns in my client systems. I can agree that JMLC horns have a very good phase curve, but express the beaming effect in the upper range. The stage effect is so strong that it sounds in your head. But it is impossible to listen for a long time, it is tiring. When I first tried SEOS waveguides, I was amazed at how tireless it sounds. The stage was no longer in my head, but in front of my eyes and the sound had become wider. Currently i am listening ATH calculated round waveguide and i can say it is the best performance.

mabat 20th January 2021 10:24 AM

2 Attachment(s)
Here's the whole beauty from the previous example (numerical issues above 8 kHz due to the reduced mesh resolution). And now give me a break with this beaming ****.

mrk7 20th January 2021 11:44 AM

Quote:

Originally Posted by mabat (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6494324.html#post6494324)
I decided to release my first "serious" design of this type... ST260 (ST = Small Teaser), cca ⌀260 mm x 83 mm. Throat entry angle is 19 and should work well with majority of 1" drivers.


Thank you for this! It should make a great reference horn. :D

Ro808 20th January 2021 04:32 PM

Quote:

Originally Posted by mabat (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6496277.html#post6496277)
It seems from the results gathered so far that the actual contribution of HOMs (inherent to a profile) will be generally very low, at least up to a rather high frequency. I'm more and more convinced that what is observed as "disruption of pressure field" is almost always caused by a suboptimal mouth termination.

To my, albeit limited, knowledge, HOMs are (mainly) related to higher frequencies and as such a byproduct of sudden changes in the horn profile near the throat.

mabat 20th January 2021 04:36 PM

And it seems that they will be pretty low intensity even for an OS waveguide.

Ro808 20th January 2021 04:46 PM

Quote:

Originally Posted by mabat (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6496451.html#post6496451)
Here's the whole beauty from the previous example (numerical issues above 8 kHz due to the reduced mesh resolution). And now give me a break with this beaming ****.

Not my cup of tea, but I bet this horn works wonderfully with the TAD TD-2001.

mabat 20th January 2021 04:49 PM

1 Attachment(s)
Yes, best sounds with TAD TD-2001 :cheerful:

mabat 20th January 2021 05:28 PM

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BTW, this was a 10-minute work with Ath including the BEM run. Should anyone want to explore this breakthrough technology, here's the script.

wesayso 20th January 2021 05:35 PM

Almost laser sharp! :)

gedlee 20th January 2021 08:52 PM

Quote:

Originally Posted by Ro808 (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6496162.html#post6496162)
The intention, purpose if you wish, of JMLC's method is to calculate/design horns that provide the smallest reflectance and diffraction, a smooth pressure field and subsequently (due to the 'natural' expansion) generate a very low amount of HOMs.

Well, as this thread shows, none of that happened.


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