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How a horn amplifies sound

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Technically, impedance matching is not amplification since the total amount of power is fixed.  Actual amplification would require additional power to be added and horns are not powered devices.

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In electronics, impedance matching is the practice of designing the input impedance of an electrical load or the output impedance of its corresponding signal source to maximize the power transfer or minimize signal reflection from the load. Wikipedia
 
 
 

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