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In a speaker there is a spring, an electromagnet (a magnet powered by electricity) and a diaphragm (the cup shaped bit).

Electricity turns the electromagnet on and off which pulls the spring back and forth causing the diaphragm to vibrate, this vibrating diaphragm pushes the air back and forth which forms waves in the air this is the acoustic energy that we hear.

So in short, it is the cup moving back and forward that makes acoustic energy.

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14y ago

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