I had some meshing problems (Gmsh warning messages) so I just shifted the slot boundary a little further from the throat, which helped. If you don't have any issues, there's no reason why to keep it there I guess.
thank you!
Thank you all for your patience with my small Q&A attack. I am still inexperienced and lack the judgement when it comes to the causes of imperfections in audio, which naturally leads me to become questioning about the results and my usage of the tools at hand. Did not want to beleaguer the thread. My final simulation for reassurance shows that the wiggles get ever lesser with higher (throat) resolution, in this case 1 mm. I will apply what I have learned to the beta 5 and optimize some more for myself. Will be a while until I can print and measure on a real driver, but when I leave my results in the thread, you can approach me for the surface if someone wants to give it a try.
Coping with the ripples in this frequency area is a matter of degrees of freedom with the parameters. I was limited to surpress the on and near axis ripples without tightening the pattern in the HF, so yes, they stayed to have a flatter DI. Will see what ath 5 allows me to do. To me these ripples seemed minor. I also do not know yet if they can be avoided in total.
You are very much into the weeds here so I would say the simulations (for this version at least) are done
I think it's about time to build it
Thank you all for your patience with my small Q&A attack. I am still inexperienced and lack the judgement when it comes to the causes of imperfections in audio, which naturally leads me to become questioning about the results and my usage of the tools at hand. Did not want to beleaguer the thread. My final simulation for reassurance shows that the wiggles get ever lesser with higher (throat) resolution, in this case 1 mm. I will apply what I have learned to the beta 5 and optimize some more for myself. Will be a while until I can print and measure on a real driver, but when I leave my results in the thread, you can approach me for the surface if someone wants to give it a try.
Coping with the ripples in this frequency area is a matter of degrees of freedom with the parameters. I was limited to surpress the on and near axis ripples without tightening the pattern in the HF, so yes, they stayed to have a flatter DI. Will see what ath 5 allows me to do. To me these ripples seemed minor. I also do not know yet if they can be avoided in total.
I cannot follow tbqh, what's bugging you?
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Finally I have a basis function for the Tickler - Geddes Tickler
Any number of those, all with different parameters, will be possible to superimpose on the profile at selected starting positions along its length. Really looking forward how this turns out
Any number of those, all with different parameters, will be possible to superimpose on the profile at selected starting positions along its length. Really looking forward how this turns out
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If you are using a diffraction slot in a waveguide generated by ATH, I found that I was able to improve things by quite a bit by doing this:
1) generate the waveguide with ATH
2) take the waveguide and smooth the entire thing using the 'smooth' function in meshmixer
This works really nicely because the ATH software produces a hard edge at the transition between the diffraction slot and the waveguide.
I posted about how to do this in the last 4-6 weeks, but I'm too lazy to find the post.
The smooth function does this:
But that's not true, at least not in general. There are no sharp edges in what sheeple or me just created. There must be some other cause. The waveguide profile starts exactly in the same way as if no slot is present and the angles match smoothly if everything is set properly.
I made some first experiments but it will be extremely tricky as it's very sensitive. I even didn't save all the pictures of the profiles yet. Here are some random results (of which T1 was the very first and it was actually a bug with only a half of the bump - a result I can't reproduce with a "proper" bump anymore).
Next time I will try some systematic approach. It almost seems that with the right sequence of bumps and dips virtually any response could be modeled. Unfortunately I have no clue how to proceed with such a mess. Maybe with some really advanced optimization technique, who knows.
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Mostly single random bump near the throat, but this was really only a confirmation that it works at all. I yet have to think about how to make something useful from this. Series of simulations, varying one parameter at a time will be needed (position, amplitude, etc.). Perhaps some pattern will emerge.
Just a vision - if we had a "library" of tinkler bumps and their individual effects on the response, and because it's all linear, perhaps we could then measure a real driver and based on the measured response we could tweak it by adding suitable bumps? Well it sounds wierd. And most probably it wouldn't work at all due to diffferent wavefront shapes.
