I live close enough to a sports stadium to occasionally hear the roar of the crowd. But that’s just a bunch of individuals all yelling and making various noises. If that were single individual in the same stadium, I wouldn’t be able to hear anything. Do our voices amplify each other somehow, when in a group?
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The mechanism is constructive interference. Basically when you have multiple waves in the same substance, the crests add together and the troughs add together. Think of waves in water, those work similarly. If multiple waves overlap, the crests add together and make a bigger wave. Another analogy would be a double-bounce on a trampoline. You bounce the trampoline so that your wave in the trampoline lines up with the other person’s wave and they add together and they get a super bounce.
Sounds in air are waves too. When lots of people yell, their waves add up and their pressures add, making higher waves (which means a louder sound).
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