Curved ELS panels

Johan_Ch · 24th October 2007, 08:45 PM

Hi everyone!

I have e question regarding streaching the diagfram over curved spacers, lite Martin Logan dose.

When you streach the film over the spacers, wount the film form a "bowl" in the middle of the film? Or is the spacing between the horisontal spacers preventing this some how?

/Johan Ch

george a · 26th October 2007, 04:00 AM

Hi Johan

I think they stretch it in one direction only (up and down) and I imagine the film is held via a curved clamp during the process.

I imagine a bit of practice or specialized machinery helps

Cheers

george

Fanuc · 30th October 2007, 10:15 PM

Hello,

I have only recently ordered Roger Sander's ELS cookbook (not received yet) but it was David Heymayer(sp?) that done all the home work or _critical work_ with direct drive amps for Electrostats. Exploiting there advantages over other types even if the 70's amp designs themselves were primitive compared with modern stuff.

My interest in curved ELS panels is not so much that it could improve the rigidity of the panels/stators (which it could if it is done right and lower acoustic THD). But more the affect on the dispersion pattern and any advatages etc.

Having said that I need to read Sanders book (a layman's book pretty much). Read some of Walker's stuff and some of the patented theory is pretty heavy going.

Best Regards

Kevin

SkySeeker · 1st November 2007, 07:31 PM

<i> Or is the spacing between the horisontal spacers preventing this some how?</i>

Both of the above :-)

It has been said that you stretch it along the long axis only and just very little in he other direction.
I have not yet tried this myself, but plan to do so in the coming months.

Fanuc: The Sanders book is good, but it does contain some misleading explanations. So if you base your design on it, be sure to check it against the accumulated wisdom on this forum.

PS: I am a theory-only guy so far. But working to correct that :-)

Calvin · 2nd November 2007, 08:20 AM

Hi,

the main advantage of a curved panel is stability. Dispersion doesn´t spread as much as it is claimed for e.g. from ML (curving angle = distribution angle).
Besides this, the large membrane area leads to a slightly improved ´dynamic´ sound against flat segmented panels.

jauu
Calvin

24th October 2007, 08:45 PM	#1
Johan_Ch diyAudio Member Join Date: Sep 2002 Location: Sweden	Curved ELS panels Hi everyone! I have e question regarding streaching the diagfram over curved spacers, lite Martin Logan dose. When you streach the film over the spacers, wount the film form a "bowl" in the middle of the film? Or is the spacing between the horisontal spacers preventing this some how? /Johan Ch

26th October 2007, 04:00 AM	#2
george a diyAudio Member Join Date: May 2002 Location: oz	Hi Johan I think they stretch it in one direction only (up and down) and I imagine the film is held via a curved clamp during the process. I imagine a bit of practice or specialized machinery helps Cheers george __________________ george a

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30th October 2007, 10:15 PM	#3
Fanuc diyAudio Member Join Date: Feb 2006 Location: Leven, Fife	Hello, I have only recently ordered Roger Sander's ELS cookbook (not received yet) but it was David Heymayer(sp?) that done all the home work or _critical work_ with direct drive amps for Electrostats. Exploiting there advantages over other types even if the 70's amp designs themselves were primitive compared with modern stuff. My interest in curved ELS panels is not so much that it could improve the rigidity of the panels/stators (which it could if it is done right and lower acoustic THD). But more the affect on the dispersion pattern and any advatages etc. Having said that I need to read Sanders book (a layman's book pretty much). Read some of Walker's stuff and some of the patented theory is pretty heavy going. Best Regards Kevin

1st November 2007, 07:31 PM	#4
SkySeeker diyAudio Member Join Date: Aug 2007	<i> Or is the spacing between the horisontal spacers preventing this some how?</i> Both of the above :-) It has been said that you stretch it along the long axis only and just very little in he other direction. I have not yet tried this myself, but plan to do so in the coming months. Fanuc: The Sanders book is good, but it does contain some misleading explanations. So if you base your design on it, be sure to check it against the accumulated wisdom on this forum. PS: I am a theory-only guy so far. But working to correct that :-)

2nd November 2007, 08:20 AM	#5
Calvin diyAudio Member Join Date: Nov 2004 Location: close to Basel	Hi, the main advantage of a curved panel is stability. Dispersion doesn´t spread as much as it is claimed for e.g. from ML (curving angle = distribution angle). Besides this, the large membrane area leads to a slightly improved ´dynamic´ sound against flat segmented panels. jauu Calvin

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