Speaker Grille to Protect the Driver Element and Speaker Internals
How would it look if the speaker that came with your computer did not have a grill in front of speaker driver? It would look unsightly and the speaker driver and other parts would be more prone to damage. A speaker grille not only protects the driver from being damaged, they also improve the decoration of your room.
A speaker grille may consist of either a hard or soft screen/grille mounted directly in front of the speaker driver. Its main purpose is to protect the driver element and speaker internals (and possibly other audio components) from foreign objects while still allowing the sound to clearly pass. However, because it sits in the direct path of the driver, the grille interacts with the sound produced. A suitable compromise between protection and sound quality must be made based on the speaker's application.
TYPES OF SPEAKER GRILLE: It is best to purchase acoustic grilles. Usually they are made from synthetic fibers that do not stretch. The fibers are smooth so that sound waves are not impeded by them, thus ensuring acoustic transparency. Acoustic grill cloth comes in black, gray, brown and some lighter natural shades. Buy this cloth at acoustic supply stores, some electronic supply stores and fabric stores, as well as online.
1. Soft Grilles: Soft grilles are usually made from synthetic clothing or fabrics. As natural fibers prevent some higher frequencies from making it past the grill cloth, synthetic fibers (acoustic) are preferably chosen as grille clothing. Besides synthetic fibers are long lasting and less prone to tear in comparison to natural fibers. Soft grilles offer protection from small and lightweight objects, and may be water resistant to some degree but could be susceptible to being torn, or even stretched enough to reach the driver.
2. Hard Grilles: Hard grilles are preferably chosen in such an environment where they are prone to damage, such as in a room where your pet cat may scratch to reach the driver or in an outdoor concert. In this case you may consider choosing hard grilles made from steel or plastics. Because hard material is not free to move with the speaker's sound like soft material, some sound quality may lose. A grille with more holes will allow more sound to pass but will offer less protection from small objects. A speaker with too much material in front of the driver will begin to distort at higher sound pressure levels, and in severe instances could damage the speaker, resulting in unwanted rattling at the least.
3. Impracticalities: In some cases where a high quality of sound is required the grilles are generally omitted. A grille may interact too much with the sound to be practical, for instance, in studio monitors, sounds are required to reproduce so accurately that anything in the path of the speaker could obscure aspects of the sound. Some high powered subwoofers (such as those used in high-end car audio applications) produce such a violent sound wave that a grille is very susceptible to rattling or possibly to damage. Some speakers simply don't need a grille, perhaps because they are enclosed in a case (such as speakers found inside personal computer) and are not meant to produce high fidelity audio, but only audible tones and noises.
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