Specialist in Acoustic Components

The key points of designing the speaker enclosure 喇叭音箱設計注意事項

The consuming electronic products are limited in the dimension of speaker, unable to use the larger size leads to the imperfect result of the low-pitched sound. Therefore we need a good enclosure to extend the low frequency effect, which means we still need space, just the limitation of the form is not so strict. Generally speaking, the larger the capacity is, the better the low frequency we can gain, because most of the hand-held products still do not have enough space for enclosure.

When the speaker emits sound the diaphragm will move to compress the air in the enclosure. Thus the larger powered speaker needs better outlets to get the proper damping and reach the good low frequency, but the sound will not be destroyed by the resistant of the compressed air.

On the other hand, the sound will be exited at both of the front and the rear area while the speaker works, but the phase is 180 degree and the sound will be neutralized. Therefore it is very important to make sure that the front and the rear sound fields are completely separated, and there is no connection between the flowed air to avoid the neutralization of the sound.

Besides, to emit sound means the vibration will be generated, therefore the speaker also needs to be firmly fixed on the mechanism, and adds some shockproof material appropriately, such as the sponge, which can help to avoid the noise coming from vibration.

The design of the sound apertures is multi-apertured, and the amount of them is the more the better, at least exceed 1/8 area of the surface. The shapes of the sound apertures just need beautiful appearance to meet industrial design; but are requested to have a larger outward hole than inward. It means the part which is exposed to the outside air should be larger than inside.

消費性電子產品受限於尺寸的限制,沒辦法使用大尺寸的喇叭,故低音的效果都不太理想,

更需要好的音箱來延伸低頻的效應,但這也是需要空間,只是空間的形狀較無嚴格的限制,

一般而言,愈大的容量,低頻的增益就會愈好(因為絕大部份手持式產品,音箱都不夠大),

喇叭的振膜在發聲時會前後移動,進而壓縮喇叭及音箱內的空氣,

故功率愈大的喇叭愈需要好的洩氣孔,來取得適當的阻尼,使低頻夠,

但聲音不會因為壓縮空氣的阻力而失真,

喇叭在發聲時,振膜的前/後方都會有聲音,只是相位是180度的相位,二者會互相抵消,

所以我們要確定前後音場是分開的,不能有流通的空氣接觸,以免聲音抵消,

另外,聲音即是振動,喇叭也必需牢靠的固定在機構上,並適度的加上些緩衝吸震的材料,如海棉,

可避免發聲時的振動,形成噪音,

出音孔的設計以多孔,開孔面積多多益善,至少要多於1/8,形狀視ID美觀要求即可,

要注意的是,開孔的方式是外大於內,也就是接觸外部空氣的部份應大於內部的,形成向外擴散的角度,