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Bookshelf speaker shape

2021-03-19 439
Whether floor-standing speakers or bookshelf speakers is better is a topic often debated by audio enthusiasts when they get together. It should be said that domestic bookshelf boxes have already accounted for half of the speaker market.
There are many factors to consider when choosing a bookshelf speaker. Here we only analyze it from the perspective of the shape of the speaker and the structure of the front baffle.

1. shape
There are many types of bookshelf speakers, and the main shapes are as shown. One is a rectangular parallelepiped structure, which is currently the most common speaker; the other is a circular arc structure, the cabinet is a rectangular parallelepiped, but the front baffle is made of an arc; the third is Cone-shaped structure with large trunk at the bottom of the box: the fourth is a drum-shaped structure; the fifth is a diamond structure with a large middle part and small upper and lower parts; and the sixth is a protruding front baffle.

2. Front baffle structure

(1) The influence of the geometry of the front baffle on the tone. Modern acoustic research and listening experiments have revealed that the narrow front baffle is beneficial to improve the sound image positioning and the spatial sense of the sound field glaze. The curved surface and waist drum shape introduced above are all for the purpose of shrinking the front baffle to make the high pitch The unit panel forms an outwardly diverging arc surface, minimizing the influence of the front baffle on the tweeter. The diamond structure speaker uses the principle of front baffle interference to improve the performance of the sound field.

Bookshelf speaker shape

(2) Front baffle material and tweeter arrangement. Generally, the front baffle of a speaker is thicker than the other sides. For example, the front baffle of some speakers is 10cm thicker than other sides.
When the surrounding structure of the tweeter is symmetrical, it is unfavorable for suppressing harmful reflections from the front baffle and will cause acoustic interference in a certain frequency band. To this end, the traditional symmetrical axis placement of the tweeter can be changed, and the off-axis method is adopted, where the tweeter and the mid-woofer are not on the same axis, so as to change the poor tweeter reflection caused by the symmetry of the four periphery of the tweeter.
(3) Front baffle surface pasting technology. The lamination technology on the front baffle can improve the reflection of the high pitch. When the front baffle surface is too smooth, it will cause bad reflection of the front baffle, which will affect the sound positioning and sound field effect. For this reason, the front baffle surface lamination technology can be used to reduce the reflection coefficient of the front baffle surface.
Surface veneer can be veneer, suede material and real leather. Because the sound absorption coefficient of wood veneer is relatively small (about 0.05), it is better to pave a large area of suede material or leather with high sound absorption coefficient on the surface of the front baffle.
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