I've dealt with this for a long time lol. Here's some pics of what I had to do (granted, I had way more powerful midbass in there so the rattles were worse.)


Also note, chopping off the chunk of plastic that sticks out around the speaker on the panel will help a bit.

Peel and stick ensolite under the plastic pins. This helped IMMENSELY.


Deadener on the creaky plastic panel.


And deadener on the door itself.



You will probably need less than I did, but it's just an idea of what you might need.

 

lol i have stock speakers that rattle them but then again i have a sony headunit the worst rattle in mine was that back panel and where it hits the rear window thank you sony 6x9's and kicker 10's

 

if u got bigger speakers then the panel is possibly hitting the speaker...im having this problem myself and im looking for a dremel to shave off the piece thats in the way

 

You are having a problem with resonance. Now it's time to start shimming and isolating parts of the door panel to determine where the rattle is and remove it. Start by finding a track that consistently causes the vibration and gently press on the door panel to find the vibration. Once you find the area where it is vibrating make sure all the door panel clips are properly seated in the door panel and fully engaged into the door itself. Tiny shims of cardboard around the edge of the panel will help you eliminate the buzz in most cases.