Best of the year 2012-2013 - page 1

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,
(M. Heckl)
1 2,3,4,5
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