If your car subwoofer is playing really deep and low, the vibrations will transfer across the car. The metal panels will rattle inline when the bass from the car subwoofer drops. This can be slightly embarrassing if heard outside the vehicle and at times can also be heard inside the car. If your running lets say an 8 or 10 inch car subwoofer, in an sealed box you wouldn't have to worry about this kind of issue. But if you have multiple car subwoofers that have an cone area of 12 or 15 inches in an custom ported box, lets say an 1000 rms each, your whole car is going to flex.
From my experience, japan cars are the worst when it comes to preventing car subwoofer rattles. This is because the metals used on an japan car is constructed from cheap and brittle materials. German cars have much more solid outer metal body parts. The first thing you should consider is positioning of the car subwoofer. Facing the speaker cones towards opening of the trunk is going to make the trunk more prone to vibrations. Try facing the car subwoofers, so that the speaker cones pointing towards the inside of the car.
Sound deadening material works wonders if applied correctly. This material is usually shiny like foil and is thick, the job of car audio sound deadening material is to absorb any kind of vibrations from bass. It is easy to apply, you just need an sharp scissors. Simply cut it to the shape you want, remove the paper from behind to expose the glue and stick it down. Use an roller of some kind to press it directly onto the metal panel. If your going to use your hands to pat it down, make sure you use gloves as the material when handled can be sharp. Areas to cover are the trunk floor and trunk lid, you can double up on layers to add more padding to avoid subwoofer rattle. You can also remove the rear number plate and stick some behind it followed by remounting it to stop it shaking too.
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