ESL speakers question.

Ilianh · 13th May 2003, 05:11 PM

On diy esl designs I've seen the speaker start rolling off at around 15khz.

http://www.quadesl.com/speaker/minim...l_response.gif

What can be done to prevent that?

Thinner spacers? but they limit lower frequency reproduction.
Smaller subdivisions? the Fs goes higher
Or how thin the diaphragm needs to be?
Or how about equalisation?

One part of the esl doing only highs using thinner spacers, and the other one only mids? Would this need another audio transformer?

SY · 13th May 2003, 05:22 PM

From what I know, get a better measurement mike.

From what I've read, lower the moving mass.

I haven't had a crack at Sheldon's speakers yet, but I'll guess it's the former.

dhaen · 13th May 2003, 05:25 PM

Wait a few years, and it won't matter...

Ilianh · 13th May 2003, 05:47 PM

Quote:

Wait a few years, and it won't matter...

hehehe, I dont know for in a few years, but right now I can hear up to 20khz, and it bugs me off when there is a lack in the high end.

planet10 · 13th May 2003, 06:10 PM

because of the panel size it is very hard to accuratly measure HF. How does it sound?

dave

Ilianh · 13th May 2003, 07:16 PM

Quote:

because of the panel size it is very hard to accuratly measure HF. How does it sound?

Hum, I think there was a slight misunderstanding here.

I forgot to specify I was about to start a panel, I did not make one yet..

I'm still searching for the stator grills

The graph I posted was taken from www.quadesl.com simply to demostrate the roll-off at the 15khz+.

Anyway, What I was thinking to do is a 100cm x 30cm panel, to be able to cover from 500hz to 20khz.
And I was not sure of how this kind of relativly small panel would cover down to 500hz (at somehow nice spl's) whitout compromising the response up to 20khz.

dhaen · 13th May 2003, 07:31 PM

Hi,

I expect Sheldon will post here shortly. What his site doesn't say, he probably knows about ESL's. After all, it's his graph.
Username: stokessd

Cheers,

AndrewJ · 14th May 2003, 02:07 PM

the top end response of electrostatics is dependant upon many factors....hole size and depth in the stators, diaphragm mass, and transformer design to name a few.
An excellent reference book to read up on all of this is the "Loudspeaker and Headphone Handbook" edited by John Borwick. ISBN 0 240 51371 1
It contains a chapter written by Peter Baxandall, a life long friend of Peter Walker and is the most comprehensive treatment of electrostatics published.
It is not however a practical guide to DIY.

Andrew

13th May 2003, 05:11 PM	#1
Ilianh diyAudio Member Join Date: Oct 2002 Location: Montreal, Canada	ESL speakers question. On diy esl designs I've seen the speaker start rolling off at around 15khz. http://www.quadesl.com/speaker/minim...l_response.gif What can be done to prevent that? Thinner spacers? but they limit lower frequency reproduction. Smaller subdivisions? the Fs goes higher Or how thin the diaphragm needs to be? Or how about equalisation? One part of the esl doing only highs using thinner spacers, and the other one only mids? Would this need another audio transformer? __________________ Time is the best teacher; unfortunately, it kills all its students

13th May 2003, 05:22 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	Getting it flat to 20K From what I know, get a better measurement mike. From what I've read, lower the moving mass. I haven't had a crack at Sheldon's speakers yet, but I'll guess it's the former. __________________ If there's a sucker born every minute, where do the rest of them come from?

13th May 2003, 06:10 PM	#5
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	because of the panel size it is very hard to accuratly measure HF. How does it sound? dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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13th May 2003, 05:25 PM	#3
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Wait a few years, and it won't matter...

14th May 2003, 02:07 PM	#8
AndrewJ diyAudio Member Join Date: Sep 2001	the top end response of electrostatics is dependant upon many factors....hole size and depth in the stators, diaphragm mass, and transformer design to name a few. An excellent reference book to read up on all of this is the "Loudspeaker and Headphone Handbook" edited by John Borwick. ISBN 0 240 51371 1 It contains a chapter written by Peter Baxandall, a life long friend of Peter Walker and is the most comprehensive treatment of electrostatics published. It is not however a practical guide to DIY. Andrew

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