I.The theory and performance of certain types of modern acoustic apparatus for reproducing speech and music
N. W. McLachlan, G.A.V. Sowter · The London Edinburgh and Dublin Philosophical Magazine and Journal of Science · 1931
In a former paper published in this Journal analyses were given of both coil- and reed-driven rigid disks as applied to the reproduction of. sound. The object of the present contribution is to point a comparison between theory and practice, using these analyses. It is shown that both coil- and reed-driven disks, where the whole moving system is quite rigid, would be of little value in the reproduction of speech and music. The energy from the coil-driven disk decreases very rapidly above 1000 cycles (although good results are obtained on its axis), whereas the energy from the reed-driven disk is centered round the resonance frequency of the combination.