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The results show that absorption material is less efficient if it is mounted to the corners or on the edges between the walls and ceiling, if the sound field is more or less diffuse. If the room modes dominate the sound field, the most efficient location for the sound-absorbing material was found at one of the surfaces causing the modes.
Influence of Sound-Absorbing Material Placement on Room Acoustical Parameters
https://www.mdpi.com/2624-599X/1/3/38/htm
JM