The First CROS Hearing Aids?

In 1965, Harford and Barry were credited for the first accessible published description of across-head fitting1.  It was called the CROS (Contralateral Routing of Offside Signals).  Harford and Barry did acknowledge, however, that Wullstein and Wigand had published results on an almost identical across-head arrangement three years earlier2.  The Wullstein and Wigand work has seldom…

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Hearing Testing History: Western Electric 2-A Audiometer

Western Electric 2-A Audiometer Most hearing care professionals have heard or read that one of the early audiometers for the measurement of hearing sensitivity was the Western Electric 2-A audiometer.  Few have any idea what it looked like or what it did.  This post is pleased to bring to readers some of the best detailed…

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