A combination of ways. First off, you pick a venue with great accoustics. We’ve known since the middle ages how to design spaces in such a way as to make what is being said/sung in one spot easily audible throughout. I’ve sung unmiced in cathdrals older than the western world and been heard fine. Also training. My background is in music, and as a vocalist, I have trained myself to enunciate clearly and project the sound. Someone making speeches would recieve similar training.
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