Hi guys, I'm having a bit of a problem with some rattling sounds, and it's annoying.

The new Myvi uses 6.5inch speakers mounted at the rear doors, and when there is deep bass played loud, a rattling sound can be heard from both of them. I removed the door panels to check which component was shaking but it turns out that it was the weathershield (that clear transparent plastic which is attached to the door metal panel and protects the components from rain) was actually rattling. After doing a bit of testing, it was because the door was so tightly sealed and had very little airholes for the speakers, which causes the weathershield to shake and vibrate as the speaker tries to pull in and push out air. This only happens for bassy tracks which does a lot of air pushing so it's pretty confirmed.

Without tearing or poking holes, is there any way I could reduce the rattling? I was thinking of sticking foam sheets on the weathershield so it does not vibrate too much when it's heavier but not sure how effective that may be.

True, but I'm looking for a cost-effective solution first

Any tapes to recommend? Was thinking of Scotch tape since it can peel off easily but not sure about whether the adhesive will start melting and leaving my entire inner door panel sticky.

I could use gaffer's tape but it doesn't last under high temperature - at least for the one which is sold at TechGarage.