Yes, they have done that are are now onto meta-materials, a development on the initial work done by Hedgeman. It uses shapes to absorb.
dave
These, as i understand it, are “labyrinths”. Tiny 3D printed in the case of KEF’s current use in a tweeter.
dave
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Actually, the white "non-stick safe" versions of the scrub pads may be good for aperiodic venting and small driver fill. I would avoid the green "Scotch" pads as the abrasive is coated on the fibers and tends to flake off when flexed.
Steel wool has an oily coating on it to prevent rusting, and if there is any volatility of this material, it may interact with components in a sealed speaker box. Also the wool may crumble with flexing, as it does in normal use. Not recommended.
When I used to go camping I would bring a back-up all weather fire starter with me. A tuft of steel wool in a plastic baggie and a 9V battery in a different pocket. Be aware that if the steel wool were to contact the speaker terminals inside a wooden vented enclosure there could be a problem.
Now, there is an incentive to not turn the music up loud.
Angel Hair and Unicorn Tail
Angel Hair and Unicorn Tail are both non-metallic dampening materials made of synthetic fibers. Compared to steel wool and copper wool density is smaller and price is higher.
According to Murphy's law anything that can go wrong at generally does go wrong sooner or later, so it may be best to avoid even small possibilities of failure, even if the initial cost seems higher.
Fibers are compressible, and supposedly sufficient amount may be inserted into the speaker cabinet with brute force.
Angel Hair and Unicorn Tail are both non-metallic dampening materials made of synthetic fibers. Compared to steel wool and copper wool density is smaller and price is higher.
According to Murphy's law anything that can go wrong at generally does go wrong sooner or later, so it may be best to avoid even small possibilities of failure, even if the initial cost seems higher.
Fibers are compressible, and supposedly sufficient amount may be inserted into the speaker cabinet with brute force.
Try melamine sponges - aka magic eraser scrubber pads. Stuff is super porous and void fraction is tiny.
I manufacture speakers and in my worst nightmares I dream of steel wool.
Think why.
Think why.
Pferd is a company name that makes various tools and abrasives.
But I just looked at my box of the stuff in the cellar and it was a Klingspor product (that I bought 20+/- years ago) just called "Abrasive wool" and mentions "fibral" and it is definitely nonmagnetic and nonmetallic. Whatever it is it actually works very nicely and lasts a long time (way longer than steel wool or Scotchbrite) for a given handful, but as far as I can tell from trying to look around now, isn't made anymore and maybe hasn't since who knows when. Wish I could get more. It abrades but in the fine grade that I have, also kind of burnishes.
I avoid stainless steel for even finishing any good wood product. Small bits of steel can embed in the wood and subsequently discolor it - it's not an especially common phenomenon but not anything I want to even be a possibility.
Better isobaric heat behavior ? Dacron is terrible for this, it keeps the heat but not dissipate it in the air or very slowly. I would try to put these metallic sponge in vented port as well...
Spontex 3 Steelmax metal wire 3 pieces 12 g - VMD parfumerie - drogerie
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putt lossy one just as an internal port diffuser to break (divide) the vortex resonance but not as a variovent i.e. a brake... not as a ball in the barrel of a gun.
Is the thermal conductivity of air so rubbish ( about 10,000 times less than common metals/solids ) that the material of the filler is almost totally irrelevant, it's PURELY the surface area ?
I dunno if it's only about breaking the sound wave and divide resonances, but at least vibration into a material partially is transformed into heat by vibration behavior into the solid.
The geometrical layout of the filler is surely 99,9% what matters. But sometimes when very near, many have noticed soundind difference, for instance the wool being far superior to any polyfill materials. Some uses mostly open foam as Harbeth for instance close to 100% of the volume...
I never read for the few I looked for, any consensus on the filling cabinets science. I still have to understanbd the need of it in a woofer cabinet where the wave length is often bigger than the internal volume and filling material. But the enhanced volume due to the resistivity, I still want to understand what happen really...
The geometrical layout of the filler is surely 99,9% what matters. But sometimes when very near, many have noticed soundind difference, for instance the wool being far superior to any polyfill materials. Some uses mostly open foam as Harbeth for instance close to 100% of the volume...
I never read for the few I looked for, any consensus on the filling cabinets science. I still have to understanbd the need of it in a woofer cabinet where the wave length is often bigger than the internal volume and filling material. But the enhanced volume due to the resistivity, I still want to understand what happen really...
The way that stuff is made is super interesting. Have you seen it magnified? It's like a latticework of triangular shaped profile. It's actually quite abrasive, which is why its so effective. I wonder what kind of abrasion would happen if it was used in a speaker and against various surfaces. Would there even be much vibration? I'm always nervous because I use one on my stylus occasionally and not sure if it's wearing it faster or not. As long as people remember that and ME is considered an abrasive I would see no issue using it as stuffing tho and reckon it's work quite well actually.
Do to the amount of surface area available, steel wool can be a dangerous material under the wrong circumstances. Anything that happens to cause oxidation will also generate heat, and this can run away. This can evidently be started via electricity flowing through the wool, so I think using it in a loudspeaker would be ill-advised all around.
https://home.howstuffworks.com/steel-wool-catch-fire.htm
https://home.howstuffworks.com/steel-wool-catch-fire.htm
Agreed, anything that catches fire or can cause shorts to the speaker crossover (loose debris) is bad. Not to mention it can rust.
If you like the fine tortuous path it makes. Try melamine foam pads. It has nano structures and mostly air. Also fire retardant and never rusts or rots.
If you like the fine tortuous path it makes. Try melamine foam pads. It has nano structures and mostly air. Also fire retardant and never rusts or rots.
what do you think about nets or fabrics?
they can be metallic or made of natural or synthetic thread, in reality there are many types. fabrics with threads placed side by side should be excluded because no air passes through. unlike wool, the net or canvas does not compact over time and all the cells are equal and uniform. the woven or welded threads do not vibrate when the air is pumped back and forth by the speaker or at least they move much less. obviously they must be used in overlapping layers.
visiting google I found a net with an empty space of 20 micro, same thing for the thickness of the thread that composes it (20 micro)
they can be metallic or made of natural or synthetic thread, in reality there are many types. fabrics with threads placed side by side should be excluded because no air passes through. unlike wool, the net or canvas does not compact over time and all the cells are equal and uniform. the woven or welded threads do not vibrate when the air is pumped back and forth by the speaker or at least they move much less. obviously they must be used in overlapping layers.
visiting google I found a net with an empty space of 20 micro, same thing for the thickness of the thread that composes it (20 micro)