Haas effect - Also called the precedence effect. Delayed sounds are integrated if they fall on the ear within 20 to 40 msec of the direct sound. The level of the delayed components contributes to the apparent level of the sound.
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Ah yes, but the often quoted…
Ah yes, but the often quoted 40ms is not absolute because the brain also takes into account direction, with two ears, so the integration falls apart. Especially prevalent in old churches with column speakers on each pillar and vertical surface. The multitude of audio paths prevents the Haas effect establishing itself.
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The precedence effect is another name for the Haas effect. If delayed sounds reach the ear between 20 and 40 milliseconds after the direct sound, they are assimilated. The apparent level of the sound is influenced by the level of the delayed components.