A PIANO SPEAKER
There has recently been placed oi. the market a loud speaker reprodns or unit which is not provided . witti any horn or other sound .£ reducing channel and which is adapted to b( screwed on the .’back of the sou titling, board of a piano or underneath s grand piano.
In this way the vibrations from the reproducer unit are communicated k> the piano sound board, which is emit) cntly adapted for the reproducing oi different tones. It is claimed for this instrument thpt. used in this way, it takes advantage of the acoustic pro perties of the piano sound board which are aided by the presence of the whole sot of strings of the piano acting a.s a sound reinforcer.
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https://paperspast.natlib.govt.nz/newspapers/SNEWS19280106.2.32
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Shannon News, 6 January 1928, Page 4
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123A PIANO SPEAKER Shannon News, 6 January 1928, Page 4
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