The general theory is that people are talking louder than other people, because they fell the need to dominant into the convertation. In that way, they are sure that their opinions will be heard. Moreover, many people talked louder because they have hearing problems, so they can't check their tune.
Loud crowd is the rhyming pair for large group of people that is noisy.
A noisy disturbance by a lot of people can be called:a commotiona ruckusa brouhahaa tumultan uproar
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