The acoustic interaction of voices in ensemble: An inquiry into the phenomenon of voice matching and the perception of unaltered vocal process.
Neal Wayne. Woodruff · SHAREOK (University of Oklahoma; Oklahoma State University; Central Oklahoma University) · 2002
For Group 2, acoustic placement alone provided the best alliance of acoustic analysis and auditor/singer preference, at a rate of 50% each for close and lateral spacing. Attention to acoustic placement alone was shown to be superior to spacing alone, and the combination of acoustic placement and close spacing was shown to be equal to the combination of acoustic placement and lateral spacing.