Abstract
This article describes the fundamentals of acoustics in concert halls. The first sound we hear in concert halls is the direct sound produced by the performers. After a short time, we hear various sounds reflected from interior surfaces of a hall. These reflections play an important role in acoustics in concert halls. Influences of the intensity and the direction of reflections, and the time delay from the direct sound on acoustics are systematically explained. Finally, it was explained how the size and shape of a hall and the listening position within it influence the impression of sound in a concert hall.
