Actual subwoofer rattling

[Crisis63]

Once you have checked the box and re sealed it if it still happens it may be the voice coil is stuffed. They can scrape along the inside of the magnet.

 

[MAG00]

Once you have checked the box and re sealed it if it still happens it may be the voice coil is stuffed. They can scrape along the inside of the magnet.

It could be a number of things, from cone surround coming loose to voice coil rub. Which is exactly why I suggested he runs the subwoofer out of the box, so he can identify where on the subwoofer the noise is coming from.

Take the subwoofer out of the box, run it at a low volume and listen for issues.