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QUICK GUIDECommission an Installed Sound Environment
THE HAAS EFFECT
Humans perceive direction of sound to be coming from the position from where the first sound ar-
rives.
If a sound from a second source (in this case the delay speakers) arrives within 5 ms after the first
source, then this second source also has an influence on the perceived direction of the sound and
the listener will perceive the sound to be coming from a position somewhere between the delay
speakers and the front PA.
If, on the other hand, a sound from the second source arrives between 5 ms and 35 ms after the first
source, then this second source is perceived by the listener as a single reflection of the sound from
the front PA and has no influence on the perceived direction of the sound – the overall sound is thus
perceived to be coming from the direction of the front PA.
Finally, if a sound from the second source arrives more than 35 ms after the first source, then this
second source is perceived by the listener as a separate sound source (an echo) and the listener
perceives two separate directions of sound - from the front PA and from the delay speakers.
Therefore, giving the delay speakers between 5 ms and 35 ms (as a rule, set it to 15 ms) of delay
allows you to bring more sound level to the back of the room without altering the perception of direc-
tion of sound. This somewhat remarkable phenomena is known as the Haas Effect.
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