how do referees talk so loud?

i'm watching football and i am just wondering how referees can talk so loud that everyone hears them clearly even over the audience screaming at the top of their lungs.

is it just the place where they are standing that creates the best echo in the entire stadium?

postal p2018-01-15T00:12:55Z

They are hooked into the PA system.

LegFuJohnson2018-01-14T22:48:10Z

Never heard of a microphone before?

Blocking Back2018-01-14T22:46:09Z

They eat healthy and run a lot.

Droppy2018-01-14T22:44:22Z

Because it's a loud stadium so they have to scream

ocularnervosa2018-01-14T22:39:13Z

If you pay attention before they talk they touch their belts. They have microphones that are amplified over the stadiums speaker system.

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