Why does a sound get louder if it’s played twice at the same time?
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If by “played twice at the same time,” you mean like if the same song is played through two Bluetooth speakers, or if two people are singing the same melody, it may be related to something called ‘constructive interference.’
Interference is how two or more frequencies, like sound waves, behave in the presence of each other. If those waves from different sources are in sync to one another, their overall effect will be amplified and perceived as a louder volume. That’s what the ‘constructive’ part of it means, they build each other up.
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