Sopranos retune formants to match harmonics to boost loudness, not intelligibility

Evidence

Some female singers are also able to change the frequencies of the formants to match those of the harmonics of the note (Sundberg, 1977). This does not make the vocals more intelligible, but it raises the total level of sound, which might be desirable, for example, in opera singing. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 631

Categorization

• corroborated: 2 independent passages support this claim — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 631
• XREF: connects to: A tenor’s singer’s formant appears as boosted energy between 2.4 and 3.5 kHz. — David Howard, Jamie Angus, coustics and Psychoacoustics, 1491