The audible range of sound frequencies for human beings extends from about 20 Hz to 20,000 Hz.
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Examples of sound-absorbent materials used in auditoriums include compressed fibreboard, rough plaster, draperies, and specially selected seat materials that absorb sound effectively.
Sound-absorbent materials help in reducing reverberation by absorbing sound waves instead of reflecting them, thereby reducing the persistence and overlap of sound.
compressed fibreboard, rough plaster, draperies, and seat materials designed for their sound-absorbing properties.
Excessive reverberation is undesirable in an auditorium or big hall because it can cause sound to persist and overlap, making speech and music unclear and difficult to understand.