New Type of Cone Speaker.
A NEW type of cone speaker has heen evolved in which the diaphragms are of linen, stretched on two 2-foot square frames eight inches apart. The centres of the linen squares are drawn together by a bolt which is actuated by the driving unit. Volume with quality and a frequency response from 30 to 8000 cycles are said to be the result.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280330.2.31.12
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Radio Record, Volume I, Issue 37, 30 March 1928, Page 13
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67New Type of Cone Speaker. Radio Record, Volume I, Issue 37, 30 March 1928, Page 13
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