Round ESL

just.sounds · 3rd January 2006, 10:11 PM

Hello,

I'm doing some research on ESL
And want to ask you:

What are de drawbacks of Round ESL's?

How small can a ESL (possibly round) be made And maintain a freq resp from 200 to 20k? (output doesn't have to be very high)

I hope you can help me
thank you in advance!

Kind regards

SY · 3rd January 2006, 10:29 PM

Quote:

What are de drawbacks of Round ESL's?

Annoying to fabricate. Annoying to mount. Susceptible to Bessel resonances.

just.sounds · 4th January 2006, 08:32 AM

That is a pity
but if I make the driver not round but lets say triangular

what would be the smallest where i could get a reasonable frequency resp?

Tnx

MJ Dijkstra · 4th January 2006, 09:07 AM

triangular shape has been made at philips lab.
I've seen pictures of it. It is claimed to have a kind of distributed resonance. It is worth trying. However the maximum width (rule of thumb; max 100 times spacing distance) must not be exceeded so the width at the base is the maximum width.
I have never heard such esl, so it would be very interesting to report the results.

Regards, MartinJan

I_Forgot · 4th January 2006, 02:07 PM

I don't think it would be difficult to make a round driver. If I recall correctly, the Malme patent was illustrated with a circular driver. The resonance probably becomes a non-issue when you put some diaphragm supports in the driver, as you will have to in order to keep the diaphragm from slamming into the stators.

For 200 Hz I think you could use a circle maybe 20-24" diameter. Insulators can be cut by using a router on an armature with one end fixed at the center of the circle.

Try it out and let us know how it works out...

I_F

just.sounds · 4th January 2006, 02:18 PM

It sounds very interesting and believable because if you make a triangle that does not have equal sides it could not have a base or resonant freqenty

and 2 of them fit in a parralellogram
so it looks like it is not so hard to build but maybe this kind of design will roll of lows?

I will look into it!

Greetings

Boy Griffioen

MJ Dijkstra · 4th January 2006, 02:36 PM

Hi,

Yep, I am not sure the esl of the philips lab was a triangle, I think a parallelogram. (too long ago to remember)
Also, take a look at a picture of the new Final full range esl.

just.sounds · 5th January 2006, 01:59 PM

Does any one of you know where i can order a piece of mylar for building electrostatics?

just.sounds · 5th January 2006, 01:59 PM

So round is possible but the 20" is a bit big for my purposes so can anyone tell me if it is possible to make it smaller and keep the low end intact? some decrease in dB's is not an issue to me If it can keep a steady 78 dB at one meter (in an anechoic room so reflections can not help) i'm more than happy

Greetings
Boy Griffioen

MJ Dijkstra · 5th January 2006, 02:08 PM

Hi,

If you need Mylar (r), you can contact me (I'm in the Netherlands)
I am also able to provide you EC-coating which is the best you can get.

met vriendelijke groet, MartinJan
mj-dijkstra@zonnet.nl

3rd January 2006, 10:11 PM	#1
just.sounds diyAudio Member Join Date: Jan 2006 Location: Weesp	Round ESL Hello, I'm doing some research on ESL And want to ask you: What are de drawbacks of Round ESL's? How small can a ESL (possibly round) be made And maintain a freq resp from 200 to 20k? (output doesn't have to be very high) I hope you can help me thank you in advance! Kind regards

4th January 2006, 09:07 AM	#4
MJ Dijkstra diyAudio Member Join Date: Apr 2005 Location: Utrecht	triangular shape has been made at philips lab. I've seen pictures of it. It is claimed to have a kind of distributed resonance. It is worth trying. However the maximum width (rule of thumb; max 100 times spacing distance) must not be exceeded so the width at the base is the maximum width. I have never heard such esl, so it would be very interesting to report the results. Regards, MartinJan __________________ drs M.J. Dijkstra

4th January 2006, 02:36 PM	#7
MJ Dijkstra diyAudio Member Join Date: Apr 2005 Location: Utrecht	Hi, Yep, I am not sure the esl of the philips lab was a triangle, I think a parallelogram. (too long ago to remember) Also, take a look at a picture of the new Final full range esl. __________________ drs M.J. Dijkstra

5th January 2006, 01:59 PM	#8
just.sounds diyAudio Member Join Date: Jan 2006 Location: Weesp	Mylar Does any one of you know where i can order a piece of mylar for building electrostatics?

5th January 2006, 01:59 PM	#9
just.sounds diyAudio Member Join Date: Jan 2006 Location: Weesp	Smaller design So round is possible but the 20" is a bit big for my purposes so can anyone tell me if it is possible to make it smaller and keep the low end intact? some decrease in dB's is not an issue to me If it can keep a steady 78 dB at one meter (in an anechoic room so reflections can not help) i'm more than happy Greetings Boy Griffioen


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4th January 2006, 08:32 AM	#3
just.sounds diyAudio Member Join Date: Jan 2006 Location: Weesp	That is a pity but if I make the driver not round but lets say triangular what would be the smallest where i could get a reasonable frequency resp? Tnx

4th January 2006, 02:07 PM	#5
I_Forgot diyAudio Member Join Date: Jan 2005 Location: Phoenix, Az.	I don't think it would be difficult to make a round driver. If I recall correctly, the Malme patent was illustrated with a circular driver. The resonance probably becomes a non-issue when you put some diaphragm supports in the driver, as you will have to in order to keep the diaphragm from slamming into the stators. For 200 Hz I think you could use a circle maybe 20-24" diameter. Insulators can be cut by using a router on an armature with one end fixed at the center of the circle. Try it out and let us know how it works out... I_F

4th January 2006, 02:18 PM	#6
just.sounds diyAudio Member Join Date: Jan 2006 Location: Weesp	It sounds very interesting and believable because if you make a triangle that does not have equal sides it could not have a base or resonant freqenty and 2 of them fit in a parralellogram so it looks like it is not so hard to build but maybe this kind of design will roll of lows? I will look into it! Greetings Boy Griffioen

5th January 2006, 02:08 PM	#10
MJ Dijkstra diyAudio Member Join Date: Apr 2005 Location: Utrecht	Hi, If you need Mylar (r), you can contact me (I'm in the Netherlands) I am also able to provide you EC-coating which is the best you can get. met vriendelijke groet, MartinJan mj-dijkstra@zonnet.nl __________________ drs M.J. Dijkstra

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