Question

Why concert hall wall are curved

Answer 1

For the sound to get surrounded inside by reflection

Answer 2

Hi,

In concert hall, the main purpose of curve walls is to prevent

        and reduce retardation(production of echo/multiple reflection of sound).

If the echo is heard then the sound quality

         may affect and may result to the sound performance.

Hence to avoid it,sound absorbant or curve walls are setup in the Auditorium.

GLAD TO HELP YOU.