03 December 2014 7 475 Report

I am looking for some studies on the quantitative and usage evolution of loudspeakers production.

Is seems obvious that since the invention of the loudspeaker late 19th century, the number of loudspeaker produced and in service has always increased as well as their functionality spread-out, but I could not find studies on that subject yet.

If you know some works on the matter, please let me know.

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