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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 7th February 2021 09:33 PM

I'm glad you're having fun, guys. Because this is what it should be all about. :up:

TNT 7th February 2021 09:42 PM

1 Attachment(s)
https://www.diyaudio.com/forums/atta...1&d=1612734141

fluid 7th February 2021 09:55 PM

Quote:

Originally Posted by gedlee (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6522506.html#post6522506)
Hi Fluid

What is that clip from?

They are the waterfall plot settings from REW that I used to try and get close to the ARTA plots that mabat showed.

gedlee 7th February 2021 10:51 PM

Thanks, I hardly ever used REW and never its waterfall, so I had never seen those plots.

Curious. I am in the process of cleaning up some old code just as an exercise on my new computer. Since I have no longer any use for all the simulation code that I created years ago for my own designs, I was wondering if this would be an interest to the community.

Some months back we tried another route, I was leery at the start. Another programmer was going to interface his code to my numerical calculations. Long story short, we could never get it to work.

What I have is a measurement system based on HolmImpulse. It will take somewhat near field data, usually about a meter sometimes less, and through the same techniques that Klippel uses (except I did them long before he did) it will predict the far field, usually 10 meters. What's the big deal? Its far more accurate than just plotting the raw numbers with noise etc. The system can yield 2 degree angular data with only 13 measurement points and its been shown to match the same data taken at 90 points up to about 10 kHz.

Next step I had planned was to allow two sets of measurements and then simulate the crossover and the far field system data. It also does a LF extrapolation based on the box size and driver details. I used it extensively on all of my later speaker designs.

Is this something that would interest people or are they happy with what they have?

fluid 7th February 2021 11:23 PM

I read through the posts where that was discussed and it was a real shame that it came to nothing concrete, something coming close to a DIY Klippel would be truly awesome. I have virtually no maths skill or coding ability but if I could help in any way I would.

pelanj 7th February 2021 11:31 PM

Mr. Geddes, I am sure I would not be the only one interested in what you offer here.

Drofdissonance 8th February 2021 02:50 AM

Quote:

Originally Posted by gedlee (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6522704.html#post6522704)
Is this something that would interest people or are they happy with what they have?

I think this would be an amazing asset. would it allow us to better estimate power response and estimated in room response?

I would be willing to help an effort. only have c/c++ and python skills though. I'm guessing you used a language more suited to academic math work?

Quote:

Originally Posted by gedlee (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6522452.html#post6522452)
Having used them often, I am not a big fan of Passive Radiators, or ports for that matter.

I have several PRs in unopened boxes if anyone needs them. 15" I believe.


the ports makes sense from the horrid resonances they get, but what is the problem with PR's? I thought they where considered generally superior?

obviously its not needed if you're doing a multisub setup. but it can be nice to just have 2 speakers which are full range.

is there a big downside to having a PR setup like this, even if you may have subs? (apart from cost)

mabat 8th February 2021 06:45 AM

Quote:

Originally Posted by gedlee (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6522704.html#post6522704)
[...] Is this something that would interest people or are they happy with what they have?

It would be a dream come true to have such a system available. What would be the task, actually? I'm only afraid that to pursue this work it would require someone skilled in maths, programming and acoustics - not easy to meet. I know nothing about acoustics, or physics for that matter.

mabat 8th February 2021 07:11 AM

Quote:

Originally Posted by Drofdissonance (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6522906.html#post6522906)
... but it can be nice to just have 2 speakers which are full range.

It is :) One pair of passive speakers, a good old stereo amp and a pair of cables - I don't need or want anything more. So all of my efforts go in that direction. I can also imagine a three-way with a small midrange in a waveguide I showed earlier, instead of the one large midwoofer.

mabat 8th February 2021 07:38 AM

Quote:

Originally Posted by de45dd (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6521722.html#post6521722)
Acoustic Horn Design The Easy Way (Ath4)

Hello this one looks really well. I have checked the config files (M2 clones and this one) in the thread at around page 98-101 but it seems that the paremters have changed with newer version of ath4.7. Cany ou tell us how the config file now would look like?

I'll look at that. I haven't worked with anything asymmetric for a long time...


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