Buy theater speaker equipment

If the movie theater unexpectedly shows a movie, the speaker suddenly becomes mute, and the sound movie becomes a silent movie, as the audience will certainly be disappointed and return, as the theater business will suffer the economic loss caused by the audience's refund. How to show the audience the shocking sound effect in the movie blockbuster, that is, to meet the auditory high fidelity, but also to reflect the obvious sense of orientation, encircle, presence, and sound with the picture, the sound should also be accompanied by the corresponding sense of movement when the sound source moves in the picture, so that users in the digital sound effect, as if they were in the imposing scene. So, before buying a theater speaker, first understand the characteristics of the theater sound, which is the author from the online forum.

1. About the treble horn

Since modern cinemas have achieved stereo sound, and cinema stereo is composed of left, middle and right, the corresponding speakers are also placed behind the screen, why? So because on the one hand, the width of the movie screen is more than 10 meters, such as only set left and right stereo, so that the middle sound field is obviously weak, coupled with the film picture speaking characters are generally located in the middle, so that the best listening position is shifted back, reduced, and the sound image is separated from the image, therefore, the sound academy stereo must increase the information in the middle, and at the same time, in order to make the sound image consistent with the image, The speakers must also be placed behind the screen so that the viewer feels as if they come naturally; In addition, the placement height of the speaker must also meet the requirements of sound and painting, that is, the height of the loudspeaker horn is 2/3 of the height of the screen picture, in order to meet the requirements of the voice of the character. Also because in the theater, the sound of the left, middle and right speakers must cover the entire audience hall, so the diffusion Angle of the middle and high frequency unit, especially the treble unit, must be effectively controlled, the general requirement is 90 degrees horizontal, 40 degrees vertical, and because the speaker is placed on the screen, the treble loss is larger due to the screen's occlusion, up to 10db. It also requires the horn to have a larger diffusion Angle and play a role in sound amplification.

2, the bass unit of the theater speaker

Because the fidelity of the cinema sound is very high, it is required to restore all kinds of sounds in nature in the entire audio range and set off the ambient atmosphere of the film as much as possible, so the bass of the cinema speaker is required to dive low, like the sound of guns, the roar of car engines, etc., generally to dive to about 35Hz, and has considerable energy, which is still called subbass in professional terms. Both of these require a large caliber of subwoofer, and require 2-4 units to work in superposition. Only in this way can we meet the requirements of high fidelity.

In order to reproduce the subwoofer well, in the multichannel stereo signal, there is a special subwoofer signal, which is restored through the subwoofer speaker, and the sound pressure level of the subwoofer is 10db higher than the full band in digital stereo, and the rated power of a subwoofer is generally 600 watts. In a 500-seat theater, the subwoofer has a total power of 4,000 to 6,000 watts.