[Chaz]

So, lots of vibrations.

Exhibit A.

https://www.youtube.com/watch?v=WqOuMtkcN0o

Add some sticky metal stuff.





Ah, that's better.

https://www.youtube.com/watch?v=fuCq1EpuR9Y

Less vibration. I also put some on the rear shelf itself and then from underneath as the rubber that touches near the sub vibrates too.