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Old 18th January 2006, 01:19 AM   #1
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Default Cylinder ESL

I was wondering can you make an ESL in a cylinder shape. Have the center filled with a sound absorbing material, like a foam or with sand. These I think would make good rear speakers. Is it feasable in theory. I am going to attempt to build them.
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Old 18th January 2006, 01:55 AM   #2
Stocker is offline Stocker  United States
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That's an awful lot of very bold statements in such a short paragraph.

Rear fill...for an outdoor arena. Think "reflected waves" to see why this might not even be good for home theater.

The structure would have to be incredibly strong to make these at all large. And the tolerances required would be exacting. Are you a machinist or something?

If you fill the middle, what happens to the waves coming from the inside of the diaphragm? What happens to the other side when the waves come all the way across the tube?

This strikes me as a bad idea

But don't let that discourage you, just be aware that it will be a very great challenge.
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Old 24th January 2006, 07:28 PM   #3
beamnet is offline beamnet  Netherlands
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Suck the inside vacuum!!!
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Old 25th January 2006, 02:51 AM   #4
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No I am not a machinist. I was going to till the center with sand to deal with the waves on the inside. It is an idea and I want to try it.
Now with the vacumm. Can you do this with regular flat panels or will the pressure cause a problem?
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Old 25th January 2006, 09:06 AM   #5
beamnet is offline beamnet  Netherlands
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please reply to this and state that you were making a joke, and kew i was far from serious...

Bas
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Old 25th January 2006, 12:09 PM   #6
Stocker is offline Stocker  United States
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That's funny. Suck the inside to a low pressure...

The questions (problems) remain
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Old 25th January 2006, 12:31 PM   #7
beamnet is offline beamnet  Netherlands
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Why not ude the backwave?

Rear speakers don't need huge amounts of bass, do they?

If you'd make a circular planar speaker, make it about 12 cm diam and 1 cmhigh or so and put it on top of a carton cylinder (ones in rolls of carpet) and make a small tl from it by closing the top off and leaving the botom open!


If you keep the height well lower than 1/4 wave of the total length, you should not bump into too much low freq resonances.

a thing tha might pose a problem at high freq:

all area is beaming it's high air pressure waves at the center, making a big high pressure "axis" in the middle. If that's not homogenous, the reflection off this axis will not spread evenly over the surface


I can't imagine wahat will happen at diam = 1/2 wavelength....you ight get a serious dip or weird behaviour

all this theoretically...

Bas
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Old 25th January 2006, 01:52 PM   #8
Stocker is offline Stocker  United States
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That, plus, what happens when the wave bounces off the other side's wave? I am thinking, huge intermodulation.
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Old 25th January 2006, 02:34 PM   #9
beamnet is offline beamnet  Netherlands
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at least make it cone shaped...
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Old 25th January 2006, 04:04 PM   #10
el`Ol is offline el`Ol  Germany
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Don`t take everything personally, this is just a discussion that comes up regularly and never ends fruitfully. I would take a dynamic midwoofer firing to the ceiling and a plasma tweeter above it and be happy to have an ESL above 2 kHz.

Greets, Oliver
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