Professional sound engineers prefer to place small mics (lavaliers) on the speaker's chest. The reason is that sound comes not just from your vocal chords, but

Professional sound engineers prefer to place small mics (lavaliers) on the speaker's chest. The reason is that sound comes not just from your vocal chords, but also from your chest and diaphragm. There's a reason lavs are sometimes called "lapel mics," as they sound significantly better there, as opposed to clipped to the top of a sweater or shirt collar.