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Background Noise
Nothing is more disappointing than to have a performance of music spoiled by background noise from an air conditioning system. Although this does not often happen in major concert halls, it is all too common in churches, school auditoriums and smaller concert halls where a qualified acoustician has not been consulted.
Background noise can be of internal or external origin. The common source of internal noise is an improperly designed ventilating system. Low-frequency noise from the ventilating equipment itself may be carried through ducts into the auditorium, and a broad band of noise is often generated by air- flow in the ducts and the grills. In addition, low frequency vibrations from machinery may be transmitted by the building structure into an auditorium. Other noise originates from noisy doors, inadequate isolation from corridor noise and so on.
