If you are playing bass output from the speakers as well. Then, you are sending vibration everywhere at the door panel. Dynamat extreme or Raamat sound proofing material would definately help in this. I had one at my boot area and it works fantastic to totally eliminate my woofer vibration.

If you are going to use those foam type to do the insulation then you can forget it. It will never surpress the vibration. Only those dampening similar like those used by Dynamat could only do the job.

I've been there, done that.

Any brands that are using the same material like Dynamat, Raamat or Sikadamp could do the job but of course you have to hunt around for prices. Most of the accessories shop can do it for you. Per piece is usually range from RM150 to RM200. Depends of what brand you opt for. Some might be even cheaper. There is another forum which selling Raamat 15" by 12.5 ft for RM175. Which enough to cover 2 front door on WIRA. There is, if you DIY

tighten those screws doesn't help. As it is already tighten in the first place from manufacturer. Assuming its a new car. Those vibrating metal sound usually comes from the metal panel holding either the power windows or wind shield glass. The tiny metal bar that used to lock and unlock your door is also the culprit.

I have done dynamat extreme on my boot area to isolate my sub. The result is significant.

I just bought another half roll of Raamat and planning to put it at both door and spare tyre area. Will post again for the result.