A type of amplifier that works on waves such as sound waves and RF waves to make them louder exclusively by changing/lowering the local preasure as the wave travels down the widening channel starting through its center cavity
@emanueljoab Navigate to your profile page. On your profile's navbar there's a button called "Awards" click that and there will be a button at the top of the awards list called "Feature"
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Pluto
Some_porcupine
RainySky
