Subwoofers will have a circle shaped dust cap placed in the middle of the cone to protect the voice coil from getting dusty and dirt getting trapped inside. The dust cap is only cosmetic, if it is squashed in, it will not affect its performance or reduce sound quality in any way. Subwoofer dust caps are made from paper and are easily dented if pressed in my accident. If this has happened to your speaker, you can easily repair it yourself and restore it back to its original state.
1) You will require a vacuum cleaner to suck up the dent in the dust cap to bring the squashed part back out. This is the best way to restore it because you don't have to remove the glue and re glue it back on to repair it. So connect the vacuum cleaner into a wall outlet and switch it on. Then remove the current hoover attachment and connect the plastic pointy nozzle attachment.
2) Point the nozzle towards the middle of the dented area of the dust cap and switch on the vacuum cleaner. The suction power created by the hoover will suck out the squashed part and will pop it back out. You may want to increase the suction power, if the dent on the dust cap is not easily removable the first time.
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