How To Soundproof a Trunk and Stop Trunk Rattle from Subs

Start by removing trunk carpeting, trim panels, spare tire covers, and any accessories so the bare metal surfaces are exposed. Vacuum the area and wipe down the metal to remove dust, grease, and debris.

Clean metal surfaces help the sound deadening material bond securely and perform properly.

Apply Damplifier Pro™, directly to the metal of the trunk floor and the trunk lid. If a subwoofer is installed in the trunk, you need to apply it at 100% coverage to control panel movement and reduce vibrations caused by bass. Alternatively, you can install Spectrum™ Spray on Deadener if you prefer a liquid product.

If your vehicle has plastic trim pieces or rear deck panels that vibrate when bass hits, add a decoupling layer. Install strips of OverKill Pro™ Closed Cell Foam between plastic panels and metal surfaces to prevent contact vibration. This simple step can eliminate many of the buzzing noises caused by powerful subwoofers.

After installing the sound deadener, add a sound blocking barrier using Luxury Liner Pro™ MLV + Foam. The foam side faces down against the deadener layer and you should hit 100% coverage across the trunk floor. This layer helps block sound and even helps quiet exhaust noise from coming up into the vehicle.

Once installation is complete, reinstall the trunk carpet, trim panels, spare tire cover, and any removed accessories. Make sure all mounting points are clear so the trunk components reinstall smoothly.