Professional opera singers boost output in the 2.5 to 4 kHz range

Evidence

Trained singers, particularly those with Western operatic voices, exhibit an effect known as “vibrato” in which their f0 is varied at a rate of approximately 5.5 to 7.5 Hz with a range of between ±0.5 and ±2 semitones (Dejonckere et al., 1995). — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1336 (#expands, via linked claim)

Categorization

• XREF: connects to: Domingo and Pavarotti projected over orchestras by different resonance strategies; High-pitched soprano singing sacrifices intelligibility for audibility; Singers boost near-3 kHz frequencies to be heard over orchestras (+5 more)

Broader Connections

• Operatic vibrato modulates pitch at 5.5-7.5 Hz #expands (0.85) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1336