Abstract
It is shown that at low frequencies the pressure at the edge of a rigid diaphragm, vibrating in a hole in a thin wall, is 2/π times the pressure at the centre (the case of the moving coil loud-speaker). In the converse case of an acoustic wave impinging upon a circular orifice, the velocity increases towards the edge (the case of a resonator orifice). Were the medium nonviscous, an infinite velocity would be attained at the periphery.
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