28 January 1978
Dear Mr. Manger,
In order to soothe my bad conscience a little, I examined your loudspeakers theoretically last weekend. I was surprised to find that the radiation principle chosen by you gives a radiation time history that corresponds to the time history of the current (at least in the idealisation I examined); i.e. transient oscillations and other disturbing effects do not occur.
If I interpret the equations correctly, it seems feasible that a plate (membrane) with a stiffness decreasing towards the edge (thickness variation), leads to a slightly improved radiation efficiency.
With many thanks for your Christmas surprise,
Yours,
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