It is easy to understand how this amp works if two facts are kept in mind. (1) The first is that common steel staples are sound surface wave amplifiers because they pick up the wave in their two points simultaneously and amplify them on the staple's flat portion on the other side of the paper when they intersect "head on" (by "constructive interference"); and (2) when facing planes containing the same sound surface waves are connected along a common edge and separated by a diverging air space, the surface waves (and planes) will "squeeze" the air between them to create a growing wave of audible sound analogous to the surface wave, e.g, become a loudspeaker.
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