Haas effect is a bin-aural psycho acoustic effect regarding the sound source localization. It is known as the “precedence effect” or the “law of the first wavefront” and it was define and described by Helmut Haas in his Ph.D. Thesis in 1949. Shortly put, our hearing mechanism determine the position of a sound source based on which ear perceives it first and also its delayed “appearance”. As another approach on this, if we listen a unique sound material but one part of the system (left or right) is sufficiently delayed from the other one, we will hear the sound source coming from the part of the head where the earliest sound arrived. How far on the left or on the right it depends on how much is the difference in ms. This “effect” is working if the sound feed (the unique sound feed) has the same volume in left and the right part of the system and from this come the major benefit of using Haas Effect instead of panning in mixing part of things to add depth, reduce masking and improve the stereo imaging.

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"Haas Effect"

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