Monday July 14, 2008 at 14:21
“Classically trained sopranos also make use of a technique called “resonance tuning” to intensify the vibrations of the vocal folds and increase the power of the voice. The vocal tract—the “pipe” between the voice box and the mouth—has a series of resonance frequencies: R1, R2, R3, et cetera. Harmonics that fall at or near these resonance frequencies are most efficiently radiated as sound.”
Why can an opera singer be heard over the much louder orchestra?: Scientific American
