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Old 4th March 2009, 04:43 PM   #1
jeno is offline jeno  Norway
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Default New fullrange corona speaker

Kronos EFA speaker.

20 - 20 000 Hz, 130 dB spl.

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Patent

Note: You have to log inn to view the full patent with the pictures.

Is this the future? Any comments?
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Old 4th March 2009, 04:45 PM   #2
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Is there anything DIY about them?
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Old 4th March 2009, 07:27 PM   #3
jeno is offline jeno  Norway
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Originally posted by Cal Weldon
Is there anything DIY about them?

I guess it depends on what the manufacturer wants. They are listing several possible applications for this product, but probebly nothing for diy.

Anyway there are other threads about diy plasma speakers on this forum, so maybe someone figure out how this work and build something similar.

Just thought I should share the information about a new intriguing product (probebly just a prototype yet), and this is the place I've noticed most interest on plasma speakers.
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Old 4th March 2009, 09:14 PM   #4
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I though plasma speakers involved some high voltages making them less suitable to diy.
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Old 12th March 2009, 12:43 AM   #5
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IF this works, it is a major breakthrough.

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Old 12th March 2009, 02:28 AM   #6
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I have to read the patent again, it is sparse on detail.

They mention three main things:
- electrostatic flow control
- electronic pulse control (PWM etc)
- controlling the audio at 3kv while the main flow is 14kv

It's unclear what they are doing exactly, since they say explicitly that the "triode" version (Gerald Shirley, etc.) is low efficiency.

This suggests a "pentode" sort of approach, although I didn't see that in a quick scan of the "patent".

Some more reading will show what they actually patented and didn't. I suspect that IF it works as advertised that there are some proprietary techniques involved in the physical implementations. They say almost nothing about that.

Looks like a modulated HV power supply in effect, but that too is somewhat unclear.

There is a popular air cleaner that is actually a wide spaced ionizing wire followed by stator plates at some distance - it uses a TV type flyback transformer for the HV which ionizes a distance of about 2" and corresponds to probably something on the order of 14kv mentioned in the patent fwiw... it produces a DC air flow, it's an electrostatic "fan" of sorts...

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Old 12th March 2009, 06:01 PM   #7
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Quote:
There is a popular air cleaner that is actually a wide spaced ionizing wire followed by stator plates at some distance - it uses a TV type flyback transformer for the HV which ionizes a distance of about 2" and corresponds to probably something on the order of 14kv mentioned in the patent fwiw... it produces a DC air flow, it's an electrostatic "fan" of sorts...
Yes, I wondered a few years ago, whether the ions from just such a source could be injected between stators energised with an audio signal, in place of the charged diaphragm usually employed in an ESL.

Of course, I have no idea what kind of charge density one could achieve this way, or how practical the idea is.

Ed
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Old 13th March 2009, 06:52 AM   #8
Kontra is offline Kontra  Russian Federation
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Default Kronos

http://www.masshightech.com/stories/...huts-down.html
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Old 13th March 2009, 02:44 PM   #9
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what's the relationship between the link and the speakers??
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Old 13th March 2009, 02:59 PM   #10
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bummer they closed.
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