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I've been playing around with my AR3s and Janszen 130s and the electrostat 3 independent Realistic tweeters lately and I have more fun with those than the big Martin Logans lately.
A friend of mine in Denver just picked up a set of the ER-139s and he is just enamored with them. They have a Charles McShane)Jim's Uncle) designed woofer midrange and Janszen ESL tweeters.He did change the bias diodes to silicon and put in a more modern film cap as opposed to the NP electrolytic..Anyway,has anyone ever seen these speakers but more importantly,worked with setup?
A friend you get for nothing,an enemy has to be bought
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I took a similar approach by supplementing Advents with Microstatic add on tweeters. :)
In the history part, did you note who later took on the product (fixing quality issues according to that individual)? :)
I would love to hear a pair of these. Right now I'm using my AR3a in bedroom with the electrostat 3 tweeter on top.I turned down the tweeter pot and I let the add on tweeters do the work.
A friend you get for nothing,an enemy has to be bought
Very cool! I would definitely like to hear them. However, they look like they were designed by Rube Goldberg!
Dave
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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