Quote:
Originally Posted by airgrabber-6
I've always wondered the same thing...
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When the speaker is operating it's producing a constant movement of air. In effect it's pushing the air through the grill cloth and then drawing it back in at a very rapid rate as it vibrates to and fro to produce the sound.
If the air contains any impurities such as soot or smoke, some of these impurities will be deposited on the cloth as it passes through the grill cloth. The more you use the system, the more the dirt will begin to show. Since the woofer moves the most air, it will usually show there first.
The grill cloth acts very similar to an air filter......