The change in volume of one de cibel is theoretically the. minimum:. change discernible by the human ear. Decibel ratings are very useful in giying practical indications of the pers formances of amplifiers,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19350524.2.67
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Radio Record, Volume VII, Issue 46, 24 May 1935, Page 46
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33Untitled Radio Record, Volume VII, Issue 46, 24 May 1935, Page 46
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