I have a feeling that you could use ordinary ceramic paint. Cerakote will harden and surely would resonate too much. Also quite expensive. The idea of using ceramic coating is not a bad one; however, such a surface would be more suitable for high frequencies.
The last innovation I tried really does a good job - using silicone as glue for the household aluminium foil.
Damping becomes better (finger snipping test) and its faster than with usual glue.
Damping becomes better (finger snipping test) and its faster than with usual glue.
This Ohm-Walsh speaker appears to be legendary as well. Have a look at his patent. You have considerable experience in damping speaker cones, and I would like to know your thoughts on this.
@lekha
damping the outer ring of the cone close to the surround is often seen in the treatment of paper cones. The same for the region close to the voice coil.
Be it stiffening liquids, damping liquids or both together.
After trying out aluminium foil on loudspeaker cones since the year 2000 on a pair of Fostex FE208sigma I consider the full cover of the radiating area one sided or both sided brings the best out of every driver sonically.
All distortion generated by the instabilities of (paper) loudspeaker cones goes down.
In the 60ies after the shock good electrostatic loudspeakers provoqued amoung audio enthousiasts making the poor sound of paper cones in comparison obvious there was an answer by Kef and Leak offering stiffer cones for dynamic transducers using aluminium covered polystyrol cones.
I posted something on this in the thread here.
Here you see a fullrange driver of Mr. Pfleiderer which shows several treatments which were done to his creation the FRS20.
some description on it
https://www.hifi-wiki.de/index.php/Pfleid
damping the outer ring of the cone close to the surround is often seen in the treatment of paper cones. The same for the region close to the voice coil.
Be it stiffening liquids, damping liquids or both together.
After trying out aluminium foil on loudspeaker cones since the year 2000 on a pair of Fostex FE208sigma I consider the full cover of the radiating area one sided or both sided brings the best out of every driver sonically.
All distortion generated by the instabilities of (paper) loudspeaker cones goes down.
In the 60ies after the shock good electrostatic loudspeakers provoqued amoung audio enthousiasts making the poor sound of paper cones in comparison obvious there was an answer by Kef and Leak offering stiffer cones for dynamic transducers using aluminium covered polystyrol cones.
I posted something on this in the thread here.
Here you see a fullrange driver of Mr. Pfleiderer which shows several treatments which were done to his creation the FRS20.
some description on it
https://www.hifi-wiki.de/index.php/Pfleid
Thanks for the links. I haven't heard of him before. Found a video of his speakers. Will search further.
Have you seen this thread, https://www.diyaudio.com/community/threads/my-14-inch-full-range-speaker.99138/ ?
He had used the Walsh idea somehow, but using paper...
I visited Mr Pfleiderer in the mid 90ies at the Frankfurt High End fair.
He had a patent on his loudspeaker being able to reproduce square waves and Philipps fought against him and lost before the court.
Frs20 is a point source speaker corrected with an EQ.
Optimized damping of a paper cone at the expense of frequency response and then linearized with EQ.
Sound was quite perfect as the fullrange driver had a faraday ring reducing distortion.
Used three indirect reflecting tweeters above 5khz for the reverberant sound field.
I have a functioning original pair of loudspeakers at home.
He had a patent on his loudspeaker being able to reproduce square waves and Philipps fought against him and lost before the court.
Frs20 is a point source speaker corrected with an EQ.
Optimized damping of a paper cone at the expense of frequency response and then linearized with EQ.
Sound was quite perfect as the fullrange driver had a faraday ring reducing distortion.
Used three indirect reflecting tweeters above 5khz for the reverberant sound field.
I have a functioning original pair of loudspeakers at home.
I once built a good working fullrange loudspeaker myself and tried to get the best out of it
Have you ever opened it to see inside? Do you have any pictures? Is it the marble one?
yes, I opened them. Its a closed box system and the driver was patented, too. As you can see on the archived website pfleid.de
In the box is white baf wadding.
It has a rubber around the voice coil. The idea is to keep the high frequencies in the center and overcoming like that the beaming at these frequencies.
In the box is white baf wadding.
It has a rubber around the voice coil. The idea is to keep the high frequencies in the center and overcoming like that the beaming at these frequencies.
What if you make the wizzer much longer than the main cone itself? Thin and long, you know like the Walsh cone, but not that long, but about twice the depth of the main cone. And, point the speaker upwards?
@lekha
i would fear the instability of the whizzer cone.
If you have a really low inductivity voice coil on a fullrange driver and a modern metal basket which is less obstructive on the backside you could simply turn the driver and DSP it for linearity.
Would be a nice omni.
Paper cone does well if you diy aluminize it.
I search for something like this scanning all loudspeaker driver tests in my magazines I have like Klang und Ton or Hobby Hifi (german diy hifi magazines)
i would fear the instability of the whizzer cone.
If you have a really low inductivity voice coil on a fullrange driver and a modern metal basket which is less obstructive on the backside you could simply turn the driver and DSP it for linearity.
Would be a nice omni.
Paper cone does well if you diy aluminize it.
I search for something like this scanning all loudspeaker driver tests in my magazines I have like Klang und Ton or Hobby Hifi (german diy hifi magazines)
If not walsh alike then traditional upfiring placement of a fullrange driver and some dispersive element does the trick. Don't forget to EQ to taste.
thats a design I made without dispersion element:
loudspeaker with aluminium foil covered, diy whizzer full alu foil, faraday ring on pole piece, double magnet added
thats a design I made without dispersion element:
loudspeaker with aluminium foil covered, diy whizzer full alu foil, faraday ring on pole piece, double magnet added
I've seen all your threads. 🙂
Lincoln Walsh didn't live to see his speaker. Others made them later. What I see in it a long thin cone, not as wide as our standard cones, much narrow. German Physiks makes an even narrower and shorter coil. The owner talks about a German Engineer called Peter Dick, who re-made Walsh cone, but I can't find anything on that Peter Dick. Anyway, would you try to check a longer narrower wizzer, maybe made of cardboard? You have the measuring apparatus too.
Here is one of the newsletters, https://www.german-physiks.com/camp...6_2TWP3eYCjNBw4_SOHZ48Z9RTfbrY39pwwVXZYPhY-hd
Lincoln Walsh didn't live to see his speaker. Others made them later. What I see in it a long thin cone, not as wide as our standard cones, much narrow. German Physiks makes an even narrower and shorter coil. The owner talks about a German Engineer called Peter Dick, who re-made Walsh cone, but I can't find anything on that Peter Dick. Anyway, would you try to check a longer narrower wizzer, maybe made of cardboard? You have the measuring apparatus too.
Here is one of the newsletters, https://www.german-physiks.com/camp...6_2TWP3eYCjNBw4_SOHZ48Z9RTfbrY39pwwVXZYPhY-hd