Stereo & Electronics - Humm... in stock system...

On the driver's side plastic speaker panel cover there is a slight humm or buzz that I can hear due to the bass vibrations in the car. It's not the speaker as I replaced that, and pressing on the plastic while the system is on takes away the sound.

What has anyone done to help with this?

You need to sound deaden around and behind the plastic piece. Mine has started it, and I have the stuff in the garage to do it, just need to find the time.

What material do you use?