Ibach Tonspiegel, a historic DML
I think in this Article there is a more beautiful picture of the device:
http://www.dl0sn.de/informations/reportagen/fachpresse-bericht maiwald_radiomuseum.pdf
I think in this Article there is a more beautiful picture of the device:
http://www.dl0sn.de/informations/reportagen/fachpresse-bericht maiwald_radiomuseum.pdf
Hello Peter,
i heard about it but did not have it in the materials list
up to now.
I think some loudspeaker manufacturers use Aerogel (Focal e.g.)
to build sandwich laminates for conventional
drivers.
Would an aerogel of thickness from 0.5 to 5 mm be airtight ?
If not, we would possibly need a coating for low frequencies, where
tightness of the panel is an issue.
Then the low mass advantage compared to other materials would
decrease. Also damping is an issue.
Styrofoam e.g. has also low mass and high stiffness and is still
airtight when cut to thin panels. But styrofoam rings like a bell
and needs a damping coat IMO.
Are you experienced with aerogels ?
en:
Aerogel - Wikipedia, the free encyclopedia
ge:
Aerogel – Wikipedia
Kind regards
i heard about it but did not have it in the materials list
up to now.
I think some loudspeaker manufacturers use Aerogel (Focal e.g.)
to build sandwich laminates for conventional
drivers.
Would an aerogel of thickness from 0.5 to 5 mm be airtight ?
If not, we would possibly need a coating for low frequencies, where
tightness of the panel is an issue.
Then the low mass advantage compared to other materials would
decrease. Also damping is an issue.
Styrofoam e.g. has also low mass and high stiffness and is still
airtight when cut to thin panels. But styrofoam rings like a bell
and needs a damping coat IMO.
Are you experienced with aerogels ?
en:
Aerogel - Wikipedia, the free encyclopedia
ge:
Aerogel – Wikipedia
Kind regards
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Why is Kapa not good?
Probably the Kapa bloc with resin coating is not so far away from the Gatorfoam. Pursonic is also Polyurethane.
purSonic flat panel loudspeakers - invisible sound systems
Yeah...the capillary size in the inter-connected pore structure is so small that the water's surface tension in the small capillary crushes the glass web. Go ahead, put a piece on your tongue. If you pull it off, the surface of your tongue will come with it. (No...I did not experience that myself.) But, that is the stuff I have made/worked with before.
When people say "aerogels" I wonder what they really mean...just like "nanotechnology" that actually works on a "micro" scale.
When people say "aerogels" I wonder what they really mean...just like "nanotechnology" that actually works on a "micro" scale.
yes i know the feeling...to my knowledge neither styrofoam, polyfoam or any other readily available foam is ACTUALLY an aerogel...i believe they are by themselves extremely delicate , usually best utilised within a composite consisting of fibres(maybe Carbon fibre? Aramid? Both?) or perhaps a honeycombed Al structure, filled with it? i duno this is all way to conceptual. maybe we should all try and fashion a diamond monocoque tweeter diaphram too........or maybe if the sky wasnt the limit we could just limit it to silicon carbide....LOL
I believe they were originally developed for their heat insulating properties, and are still very hard to obtain, hence mucho expensivo
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why not use thin mylar film? like ELS panel diaphram, only with two thinner films seperated and yet glued together with some light slightly flexible adhesive???
ONLY AN IDEA like lol
Aerogel Ringing...
The "real" silica-based gels made from TEOS pre-cursors do actually ring audibly in bulk. Granted, it takes a piece larger than any cone thickness to hear. And, to make such a piece it takes a positive pressure drying oven to raise the pressure above the vapor pressure of the MeOH byproduct. It is dependent on teh final structure as well. Along the "sky's the limit" path, there are materials such as AlSiC (AlSiC Materials, Electronic Thermal Management System, Packaging Solutions) and Osprey Sandvik's SiAl alloys. Low weight, stiff, and machinable. But, I could not imagine the price of a piece to make, say a 15" cone. We use a 0.040x2.5x3.0" piece of AlSiC and it runs about $100/pc. But, that is made only 0.070" thick. To make a blank 4" deep and 16" square...or even round...
The "real" silica-based gels made from TEOS pre-cursors do actually ring audibly in bulk. Granted, it takes a piece larger than any cone thickness to hear. And, to make such a piece it takes a positive pressure drying oven to raise the pressure above the vapor pressure of the MeOH byproduct. It is dependent on teh final structure as well. Along the "sky's the limit" path, there are materials such as AlSiC (AlSiC Materials, Electronic Thermal Management System, Packaging Solutions) and Osprey Sandvik's SiAl alloys. Low weight, stiff, and machinable. But, I could not imagine the price of a piece to make, say a 15" cone. We use a 0.040x2.5x3.0" piece of AlSiC and it runs about $100/pc. But, that is made only 0.070" thick. To make a blank 4" deep and 16" square...or even round...
Has anyone actually heard one of the BMR drivers?
The Q Acoustics surround speakers use a BMR driver-
Rear Speakers - Q Acoustics Q-AV System Rear Speakers 'Disappearing' rear speakers for the Q-AV System....
Not too expensive to nick the drivers out of them.
The Q Acoustics surround speakers use a BMR driver-
Rear Speakers - Q Acoustics Q-AV System Rear Speakers 'Disappearing' rear speakers for the Q-AV System....
Not too expensive to nick the drivers out of them.
hardwax oil
Some time ago I treated a paper tweeter with two layers of hardwax oil, which is a blend of shellac, natural waxes and oils. It showed a perfect CSD after the treatment.
As I have already mentioned earlier in the thread I liked the neutrality and transparency of balsa wood, but it didn´t work due to nasty resonances.
So I wondered what the hardwax oil would do with the balsa. I had only a little bit of the (expensive) hardwax oil left, so I took two 100x500x1 mm balsa stripes, one coated on one side, one uncoated for a reference. The finger snip test showed that the first layer already gives a massive improvement and after the second coating the balsa is dead like a dodo. I didn´t remove the overshoot after each application as suggested, this gives a rough surface, but saves time and money (two layers probably wouldn´t be sufficient otherwise). I am quite sure a double coating on both sides of a 3 or 4 mm balsa plywood would tame it sufficiently.
I am currently not in the mood of organizing two monstrous boards, apart from the fact that the little rooms in my old house aren´t very well-suited for planar speakers. So I pass this finding over to the public.
Oliver
Some time ago I treated a paper tweeter with two layers of hardwax oil, which is a blend of shellac, natural waxes and oils. It showed a perfect CSD after the treatment.
As I have already mentioned earlier in the thread I liked the neutrality and transparency of balsa wood, but it didn´t work due to nasty resonances.
So I wondered what the hardwax oil would do with the balsa. I had only a little bit of the (expensive) hardwax oil left, so I took two 100x500x1 mm balsa stripes, one coated on one side, one uncoated for a reference. The finger snip test showed that the first layer already gives a massive improvement and after the second coating the balsa is dead like a dodo. I didn´t remove the overshoot after each application as suggested, this gives a rough surface, but saves time and money (two layers probably wouldn´t be sufficient otherwise). I am quite sure a double coating on both sides of a 3 or 4 mm balsa plywood would tame it sufficiently.
I am currently not in the mood of organizing two monstrous boards, apart from the fact that the little rooms in my old house aren´t very well-suited for planar speakers. So I pass this finding over to the public.
Oliver
Hi,
I have been following this thread, a few questions if I may?
Is there a difference between the Dayton and the buyout?
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Parts-Express.com: Dayton DAEX25 Sound Exciter Pair | stick on speaker exciter tactile transducers sound transducers nxt sonic impact 5029 5029 sound pads hidden speakers daex25 cyber121
Has anyone tried these?
Parts-Express.com: Sonic Splash SSP 4.0 Transducer | full range shaker ibeam tactile bass shaker transducer tactile transducer butt shaker seat shaker
Gary
I have been following this thread, a few questions if I may?
Is there a difference between the Dayton and the buyout?
Parts-Express.com: Surface Transducer Turns Virtually Anything Into A Speaker | CYBER09 stick on speaker exciter tactile transducers sound transducers nxt sonic impact 5029 5029 sound pads hidden speakers daex25 Marcato DIY projects fbr1
Parts-Express.com: Dayton DAEX25 Sound Exciter Pair | stick on speaker exciter tactile transducers sound transducers nxt sonic impact 5029 5029 sound pads hidden speakers daex25 cyber121
Has anyone tried these?
Parts-Express.com: Sonic Splash SSP 4.0 Transducer | full range shaker ibeam tactile bass shaker transducer tactile transducer butt shaker seat shaker
Gary
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