Acoustic measurements require environmentally controlled conditions

Evidence

Such details can be calculated theoretically from first principles, or measured experimen­ tally in which case they must be carried out in an environment which either has no effect on the acoustic recording or has a known effect which can be accounted for mathematically. An environment which has no acoustic effect is one where there are no reflections of sound-ideally this is known as “free space.” — David Howard, Jamie Angus, coustics and Psychoacoustics, 1084

Categorization

• QUESTION: How precisely is the known effect of a non-anechoic room accounted for mathematically?