Discussion:
Massless speakers
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Gary Gallagher
2018-03-25 06:45:11 UTC
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Never heard of this. Using laser plasma as driver for a speaker. Here as
weapon - but it would be interesting to hear/see a refined version of
this. I'm curious about the spinning disk set up at the end of the video
there appears to be some sort of modulation in the sound.

US MILITARY DEVELOPING LASER PLASMA SPEAKERS
<https://hackaday.com/2018/03/24/us-military-developing-laser-plasma-speakers/>

Gary
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Augustine Leudar
2018-03-25 07:23:08 UTC
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Ive been wondering for a while whether it was possible to use
electromagnetic waves interferance patterns to generate sound in 3D space
- the conclusions my physisit friends had was yes - possible - but not
without killing anyone that heard it .Plamsa is a bit different of course
to an EM wave....
Post by Gary Gallagher
Never heard of this. Using laser plasma as driver for a speaker. Here as
weapon - but it would be interesting to hear/see a refined version of
this. I'm curious about the spinning disk set up at the end of the video
there appears to be some sort of modulation in the sound.
US MILITARY DEVELOPING LASER PLASMA SPEAKERS
<https://hackaday.com/2018/03/24/us-military-developing-
laser-plasma-speakers/>
Gary
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Dr. Augustine Leudar
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Company Number : NI635217
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Bearcat Şándor
2018-03-25 10:41:16 UTC
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Accapella Audio Arts has been making horns with plasma tweeters for a while
now. They are some of the largest, and most expensive speakers made.
Awesome in thier rediculousness, i'd be afraid that someone would get drunk
at my home and mistake them for a sink or a urinal.

http://www.acapella.de/en/
Post by Augustine Leudar
Ive been wondering for a while whether it was possible to use
electromagnetic waves interferance patterns to generate sound in 3D space
- the conclusions my physisit friends had was yes - possible - but not
without killing anyone that heard it .Plamsa is a bit different of course
to an EM wave....
Post by Gary Gallagher
Never heard of this. Using laser plasma as driver for a speaker. Here as
weapon - but it would be interesting to hear/see a refined version of
this. I'm curious about the spinning disk set up at the end of the video
there appears to be some sort of modulation in the sound.
US MILITARY DEVELOPING LASER PLASMA SPEAKERS
<https://hackaday.com/2018/03/24/us-military-developing-
laser-plasma-speakers/>
Gary
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--
Dr. Augustine Leudar
Artistic Director Magik Door LTD
Company Number : NI635217
Registered 63 Ballycoan rd,
Belfast BT88LL
www.magikdoor.net
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Bearcat M. Şándor
Feline Soul Systems LLC
Voice: 872.CAT.SOUL (872.228.7685)
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David Pickett
2018-03-25 11:34:31 UTC
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Are these not the same as the Ionophone speakers,
sold as Ionofane tweeters in the 1960s? They were flat from 10kHz to oo!

David
Post by Bearcat Şándor
Accapella Audio Arts has been making horns with plasma tweeters for a while
now. They are some of the largest, and most expensive speakers made.
Awesome in thier rediculousness, i'd be afraid that someone would get drunk
at my home and mistake them for a sink or a urinal.
http://www.acapella.de/en/
Post by Augustine Leudar
Ive been wondering for a while whether it was possible to use
electromagnetic waves interferance patterns to generate sound in 3D space
- the conclusions my physisit friends had was yes - possible - but not
without killing anyone that heard it .Plamsa is a bit different of course
to an EM wave....
Post by Gary Gallagher
Never heard of this. Using laser plasma as driver for a speaker. Here as
weapon - but it would be interesting to hear/see a refined version of
this. I'm curious about the spinning disk set up at the end of the video
there appears to be some sort of modulation in the sound.
US MILITARY DEVELOPING LASER PLASMA SPEAKERS
<https://hackaday.com/2018/03/24/us-military-developing->>
Post by Bearcat Şándor
laser-plasma-speakers/>
Post by Augustine Leudar
Post by Gary Gallagher
Gary
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Post by Augustine Leudar
Post by Gary Gallagher
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Dr. Augustine Leudar
Artistic Director Magik Door LTD
Company Number : NI635217
Registered 63 Ballycoan rd,
Belfast BT88LL
www.magikdoor.net
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Post by Bearcat Şándor
Post by Augustine Leudar
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Bearcat M. Şándor
Feline Soul Systems LLC
Voice: 872.CAT.SOUL (872.228.7685)
Fax: 406.235.7070
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Politis Archontis
2018-03-26 07:25:44 UTC
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Hi,

here in Aalto university there has been quite a lot of research using lasers to generate precise omnidirectional impulses at various focusing points for impulse response measurements of enclosures.

I also remember during a lecture in ISVR, UK, the lecturer mentioning these old plasma tweeters, saying they did not get very far cause they were ionizing the air producing hazardous levels of ozone :-D .

Archontis Politis



On 25 Mar 2018, at 14:34, David Pickett <***@fugato.com<mailto:***@fugato.com>> wrote:

Are these not the same as the Ionophone speakers, sold as Ionofane tweeters in the 1960s? They were flat from 10kHz to oo!

David
Post by Bearcat Şándor
Accapella Audio Arts has been making horns with plasma tweeters for a while
now. They are some of the largest, and most expensive speakers made.
Awesome in thier rediculousness, i'd be afraid that someone would get drunk
at my home and mistake them for a sink or a urinal.
http://www.acapella.de/en/
Post by Augustine Leudar
Ive been wondering for a while whether it was possible to use
electromagnetic waves interferance patterns to generate sound in 3D space
- the conclusions my physisit friends had was yes - possible - but not
without killing anyone that heard it .Plamsa is a bit different of course
to an EM wave....
Post by Gary Gallagher
Never heard of this. Using laser plasma as driver for a speaker. Here as
weapon - but it would be interesting to hear/see a refined version of
this. I'm curious about the spinning disk set up at the end of the video
there appears to be some sort of modulation in the sound.
US MILITARY DEVELOPING LASER PLASMA SPEAKERS
<https://hackaday.com/2018/03/24/us-military-developing->> > laser-plasma-speakers/>
Gary
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--
Dr. Augustine Leudar
Artistic Director Magik Door LTD
Company Number : NI635217
Registered 63 Ballycoan rd,
Belfast BT88LL
www.magikdoor.net<http://www.magikdoor.net>
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David Pickett
2018-03-26 07:39:11 UTC
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Post by Politis Archontis
I also remember during a lecture in ISVR, UK, the lecturer mentioning
these old plasma tweeters, saying they did not get very far cause they
were ionizing the air producing hazardous levels of ozone :-D .
Rubbish! A friend of mine had a pair and they worked well and nobody
I know suffered from ozone exposure.

The problems were a) they were patented, b) they were very expensive
and c) they wouldnt work below 10kHz unless loaded by an enormous horn!

David
Gary Gallagher
2018-03-27 02:34:49 UTC
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Archontis,
Was you group using a dual laser set up or where you
depending on dust/debris in the air to trigger the noise?

Gary
Post by David Pickett
Post by Politis Archontis
I also remember during a lecture in ISVR, UK, the lecturer mentioning
these old plasma tweeters, saying they did not get very far cause they
were ionizing the air producing hazardous levels of ozone :-D .
Rubbish! A friend of mine had a pair and they worked well and nobody
I know suffered from ozone exposure.
The problems were a) they were patented, b) they were very expensive
and c) they wouldnt work below 10kHz unless loaded by an enormous horn!
David
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