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A New High Frequency Speaker for High Fidelity Systems

There has been a problem in the reproduction of sound to provide a projector which will have absolutely no high frequency limitations within the range of human hearing. With a source of this calibre at our disposal, we can then listen to and make true comparisons between any desired sources of sound, evaluating the naturalness of reproduction and the ratio of signal to noise. Some electrostatic loudspeakers have approached this criterion, but have well-known limitations, and one or two electromagnetic open-face tweeters have also approached this performance, although with limitations of their own. The tweeter as described was evolved by a series of experiments, starting with the discovery that a particular horn-driver unit, having a convex phenolic diaphragm, appeared to have fairly flat frequency characteristics even with the horn removed, although the sensitivity was below a usable level. Subsequent additions to the structure improved the flatness of response and sensitivity.

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