The study investigates choir rehearsal room physical and acoustical parameters. Thereverberation time measurements (T30) were carried out in twenty choir rehearsalrooms. The measurements were provided according to ISO 3382-1:2009. Based onacquired T30 and room volume, the lower and upper limits of T30 and sound strength Gwere estimated (ISO 23591, 2021). Six out of 20 rehearsal rooms had T30 sufficient forrequirements specified for quiet acoustic music. T30 and sound strength G valuesallowed us/me to model the optimal acoustical environment for choir rehearsalsaccording to the number of singers and choir type