I think many years back one of the designers came on to the site(can't remember which)and told the story of the design and how the vast amounts of money disappeared .
They thew vast amounts of money at this project.
Should have stuck with dml.
Steve.
I know I have posted the response of the 6mm panel before showing the hump below 100hz and the excellent response above up to and beyond 20k.
I was just holding the microphone at about half a metre in front of the panel.
Not bad for a 2ft panel with an exciter glued on and nothing else done to it.
Easy peasy.
Steve.
I was just holding the microphone at about half a metre in front of the panel.
Not bad for a 2ft panel with an exciter glued on and nothing else done to it.
Easy peasy.
Steve.
Attachments
Well, Danilo Herger uses that sketch in his patent. He actually mentions Karavashkin "thesis" in his patent,
The "thesis" that was missing in the internet, but the working link was given to us by @Alvipet in this post #8,175. Maybe, he'd know the answer to your question. If you revisit the post #8,192 and watch the video, you might decide to ask or not.
Here is the US application of the said patent.
Anyway, I am not pursuing that matter anymore.
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Further to post #8,248,
here is the US application of the Herger patent on the exciter used in the patent above. It is being filed worldwide.
If I find more info I'll post them, but won't analyse their scientific values.
here is the US application of the Herger patent on the exciter used in the patent above. It is being filed worldwide.
If I find more info I'll post them, but won't analyse their scientific values.
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Did you see the video I posted? Recorded via my phone so not the best quality, but with headphones you get a better idea. In my room at the moment I've also got some markaudio MS 11 fullrange drivers in a MTL cabinet, both speakers are hooked up to a sansui 505 amp which has twin speaker hook up and a speaker A and speaker B switch, so you can flick between speakers on the fly. I much prefer my panels.
Yes I did listen to your video, not a carpet in sight 😁
At last We are getting some nice recordings of different types of panels .
Hopefully there will be more ?
I could see what looked like a grey disk in the Middle of the wood panel and presumed it was the dml ,bendingwave panel ?
Steve.
Looks like someone is trying to reinvent the wheel.
A rose by any other name ,would smell as sweet !
Steve.
Paper would probably match the efficiency and sound of eps.
I did have some experience with thin film , it was OK at low levels but as soon as I turned the volume up it went to pieces.
It was a nightmare ,so moved on.
Steve
I've been experimenting with holes of different sizes and placement around the panels, that circle you can see is one of the cutouts, nothing scientific 😄 just playing.
You can watch the "reinvented wheel" in this post #8,192 🙂 And, listen to the sound.
Related to US20220345823A1 and US20220345825A1
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I'm not sure, but I think the penny has dropped?
This is similar to a piezoelectric bending driver ,but with more force.
The 1 and 2 positions on the panel surface are two exciter positions.
Out of phase with each other, if mounted rigidly to a back brace ,they will force a bend in the panel as in the picture , causing a wave.
Let me know what you think.
Steve.
Interesting. Thanks for pointing that out. When I said that the "transverse gas wave" concept was not mentioned in the Herger patent, I was referring to this one (filed 6/2020):
https://patents.google.com/patent/RU2743892C1/en
which still does not mention it as far as I can tell. But as you point out, indeed it is mentioned in this other one filed just two months later:
https://patents.google.com/patent/RU2744773C1/en
Curiously, the two patents describe pretty much the same exact features, but only the second one mentions the significance of the "Karavashkin transverse gas waves". Patent strategy can be confusion, but I have to wonder if they figured it would be unlikely to be granted in the US or Europe in the original form, but then somebody had the idea to toss in the Karavashkin "thesis". Regardless of how dubious the thesis is, they thought it might be worth a shot.
Eric
Im confident that Mr Karavashkin’s works are not merely pseudoscience, but a hoax. And I’m confident that Mr Alvipet and Mr chdsl (possibly the same person) know that already. If you get him excited, Mr chdsl lapses into Russian speech forms.
The thing is there are 4 Herger Russian patents, and 4 equivalent US patent applications. It takes time to find these out.
Steve,
Can you clarify what you believe you now understand but previously didn't? Are you talking about this transverse gas wave concept, or something else?
I do agree that two exciters out of phase would create bending moments, that would be different and perhaps stronger for at least some frequencies than a single exciter. But neither of the Herger patents specify that two exciters are necessary, let alone that when two are used they are run out of phase.
When they talk about "antiphase" components, I read it as referring to this type of thing, which happens in a DML regardless of how many exciters there are:
Are you thinking something different?
Eric