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When a sound is followed by another sound by a very short amount of time –  under 2 ms for clicks, under 50 ms for most complex sounds – the listener hears them merged together as a single sound. Delays over 50-100 ms are heard as echoes, flams, or bad timing.

In my own experiments, I have found that even the two sounds may appear to “happen” at the same time, changing the timing relationship between them can change the timbre of the merged sound.

Law of the First Wavefront, Haas Effect,
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