I hope problem #1 is as easy as a bad or loose rca, hope its not my amp

We dont hear these noises going over bumps or anything, its just any mechanical noise the cd player makes (reading, spinning, loading, etc.) we hear through the subwoofers.
I might try using a friends cd player to see if its the cd player at fault.

Problem 2, you said ground through the rca's, but ive read this ends up grounding through the speakers, shortening the life of them?
So could grounding to the chassis help?

thanks for the help and any more ideas would be helpful