Acoustic and perceptual measures of SATB choir performances on two types of portable choral riser units in three singer-spacing conditions

Abstract

Under controlled conditions, we assessed acoustically (long-term average spectra) and perceptually (singer survey, listener survey) six performances of an soprano, alto, tenor, and bass (SATB) choir (N = 27) as it sang the same musical excerpt on two portable riser units (standard riser step height, taller riser step height) with varied dimensions of largely horizontal space (close spacing, lateral spacing, circumambient spacing) between singers. Given previous research that suggested horizontally spread spacing between choristers contributes to chorister perceptions of more efficient vocal production and audience preferences for choral sound, we wondered: (1) if spectra analyses might point to a possible acoustical explanation for auditor preferences; and (2) if increasing the height of riser steps to add more vertical space between rows of singers would affect choir sound.Statistical analyses of spectra data acquired from an audience position microphone found significant differences (p