PIEZO NXT type panel - Page 42

mondogenerator · 21st October 2009, 06:59 AM

Quote:

Originally Posted by UKPD

The idea was to use it in a sandwich type of structure in between two skins. Does anybody know how resonant Aerogel is? I only saw it in a granular form.

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

mikadosan · 21st October 2009, 08:11 AM

Quote:

Originally Posted by mondogenerator

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

Nothing new under the sun then...

croat47 · 21st October 2009, 11:47 AM

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...

inrank · 23rd October 2009, 01:33 PM

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.

el`Ol · 23rd October 2009, 02:54 PM

You find my listening impressions including the BMR in post 383.

jzagaja · 23rd October 2009, 03:01 PM

I have BMR drivers. They are very good, well balanced loudspeakers. No complaints. Much better then more expensive Tangbands. For about 10-20$ a true star.

el`Ol · 29th October 2009, 09:48 AM

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

frank ziel · 31st October 2009, 03:46 PM

Hi,
what about this material:
SwissCell - The Wall AG
Rg.
Frank

Garytr · 2nd November 2009, 02:00 PM

Hi,
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

el`Ol · 3rd November 2009, 11:41 AM

I wonder whether this stuff has other damping properties than solid steel:
http://www.lamera.se

21st October 2009, 11:47 AM	#413
croat47 diyAudio Member Join Date: May 2005 Location: Eastern Shore, Maryland	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... __________________ Regards, Aaron

29th October 2009, 09:48 AM	#417
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	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

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23rd October 2009, 01:33 PM	#414
inrank diyAudio Member Join Date: Oct 2005	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.

23rd October 2009, 02:54 PM	#415
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	You find my listening impressions including the BMR in post 383.

31st October 2009, 03:46 PM	#418
frank ziel diyAudio Member Join Date: Jan 2005 Location: Berlin	Hi, what about this material: SwissCell - The Wall AG Rg. Frank

2nd November 2009, 02:00 PM	#419
Garytr diyAudio Member Join Date: Mar 2006 Location: Ancaster, ON, Canada	Hi, 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

3rd November 2009, 11:41 AM	#420
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	I wonder whether this stuff has other damping properties than solid steel: http://www.lamera.se

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