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The K-coupler, a new acoustical-impedance transformer

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1 Author(s)
Poppe, M. ; State University of New York, Stony Brook, NY, USA

The validity of a new approach to the problem of matching the acoustical impedance of a piston to the acoustical impedance of the medium into which it radiates power is examined. The device, called a K-coupler, consists in part of a duct or pipe which has an exponentially increasing opening cut in one side. It is shown that the behavior of the K-coupler may be approximately described by the use of equations similar to those that describe the behavior of an exponential horn. Experimental data that show input impedance as a function of frequency are presented.

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Audio and Electroacoustics, IEEE Transactions on  (Volume:14 ,  Issue: 4 )