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Old 23rd October 2013, 07:27 PM   #11
ScottG is offline ScottG  United States
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Join Date: Feb 2003
Location: US
Originally Posted by sreten View Post
..Why are there no rear
loaded electrostatics ?

Or horn loaded electrostatics ?

rgds, sreten.
There are, or have been.

A few manufactures did (and one still does) electrostat's with enclosures.

At least one did a shallow "horn" for a fullrange electrostat (Stax).

And I think there have been a few super-tweeters over the years utilizing both horns and enclosures.

Currently in production you've got this:

JansZen Electrostatic Speakers
perspective is everything
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Old 23rd October 2013, 11:15 PM   #12
tvrgeek is offline tvrgeek  United States
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Location: Md
If you want to understand dipole planer driver enclosures, why not start with one of the inexpensive planer drivers instead of attacking more than one monumental problem at a time?

I think you would need more like 200mm to be useful, not 20. Just my thin understanding.
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Old 24th October 2013, 11:22 AM   #13
hesener is offline hesener  Germany
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Join Date: Mar 2005
Location: Munich, Germany
DIY tweeter
My goal is a supertweeter, not a fullrange driver. I was starting from B&W's statement that their tweeter membrane only moves 0.3mm, and that is something a ELS can do as well. Building a small ELS is much like building a electrostatic headphone, and the drive levels are comparable - ample proof this has been done before.

Fundamentally it doesnt make a difference IMHO if a (thin) aluminum, beryllium or diamond membrane is moving back and forth (its thickness designed to resist the driving force applied at its perimeter, through the voice coil), OR if it is a thin sheet of plastic with the driving force applied across the whole surface. In both cases (ignoring partial breakup) the membrane is much heavier than air, so the issue of impedance matching exists, that horns so elegantly adress.

But my main thing I am trying to get my head around is the damping of the back wave of a tweeter, and the tapered tube with damping as realized by B&W is the starting point for me. Can somebody point me towards a more thorough (mathematical) analysis that could be applied here?
Paradise documents are here: Link list
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Old 24th October 2013, 02:18 PM   #14
DavidL is offline DavidL  United States
Join Date: Jul 2010
If what you want to improve is the polar radiation of the higher frequencies, then mounting a regular tweeter on the back of the enclosure will help that a lot. No super tweeter needed.
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Old 26th October 2013, 01:49 AM   #15
Alexlaboratory is offline Alexlaboratory  Australia
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Join Date: Jan 2012
Originally Posted by tvi View Post
B&W made an ESL tweeter

Click the image to open in full size.

Maybe you need something like Sony SA-S1 to play with...

Click the image to open in full size.


The Sony's SA-S1 is one of the best tweeters I ever heard , trully hi-fi
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Old 26th October 2013, 06:26 AM   #16
Inductor is offline Inductor  Portugal
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Location: Cascais
Maybe this is of some interest to the forum...

SHACKMAN Electrostatic Loudspeakers link
1970 B&W M70 pdf
1974 B&W DM70 pdf
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