How do you fix a sub when it rattles?

To fix a rattling subwoofer, first, check for any loose screws or fasteners on the enclosure and tighten them. Inspect the subwoofer itself for any physical damage, such as a torn cone or loose connections, and repair or replace any damaged components. Additionally, ensure the sub is properly mounted and that the enclosure is sealed well to prevent air leaks. If the issue persists, consider adjusting the gain or crossover settings on your amplifier or receiver to minimize distortion.