When listening to music, people can use their ears to determine the direction of the sound and determine the location of the sound source. This is because we have two ears (the so-called “binaural effect”) with a distance between ears of about 20 cm. When the sound from the same source reaches both ears, there are differences in time, intensity, and phase. It is from this difference that we have completed the positioning of "sound image".
The ear lengths are on both sides of the head, and the horizontal resolution of the horizontal direction is much better than that of the upper and lower vertical directions. Usually, the horizontal direction can be resolved by 5° to 15°, but in the vertical direction, Sometimes it's more than 60° to tell.
The sense of directionality in hearing makes it possible for us to “concentrate” in a noisy environment to hear a special sound coming from a certain direction. If we plug one ear and listen to it with a single ear, the above the sense of direction will disappear and the listening environment will be seriously disturbed by the environment and the sound will be ambiguous. The use of the sense of direction of the sense of hearing requires us to arrange speakers in the hall to ensure that the directions of “viewing” and “listening” are consistent as far as possible, that is, the sound sources heard by the ears and the sounds seen by the eyes. The source comes from the same direction. This requires us to use a "centralized" sound reinforcement system as far as possible - focus the speakers on both sides of the stage and make the speakers as close as possible to the sound source in the horizontal direction. As far as the vertical position of the speakers is concerned, it tends to be less affected.
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