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In Reply to: RE: I did find some info afterall. posted by Michael Samra on March 23, 2016 at 11:47:18
Very cool! I would definitely like to hear them. However, they look like they were designed by Rube Goldberg!
Dave
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and the tweeter was designed by Janszen and Rube Goldberg may have designed the cabinet?
ERC
In the mid-1970's, A. A. Janszen was retained by Electrostatic Research Corporation to develop a mass-market hybrid. What he developed was a fascinating and unprecedented, omnidirectional design that would be called the ER-139, to be retailed at only $139/pair.
It employed a rear-radiating electrodynamic woofer/midrange designed by Charles McShane, former Director of Loudspeaker R/D at AR (Acoustic Research Corp.), and electrostatic tweeters with numerous innovations developed by Arthur A. Janszen. The purpose of omnidirectionality was to achieve a room-averaging effect similar to that of a full range electrostatic dipole, but without the unwanted front/rear phase cancellation. Some readers may recall that the "ball of sound" approach was moderately in vogue at the time.
A friend you get for nothing,an enemy has to be bought
Hi Mike,
I would be interested to hear more about the implementation of this design. I suspect there are many designs that fell to the wayside for reasons other than the quality of its sound. The goal sound very worthwhile.
I have not head the term "ball of sound". What does it mean? (I have heard "wall of sound".) It does sound like an orgy of good music!
Dave
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