I finally fixed my speaker rattle and I’m now very happy with the premium sound system where before I was completely disgusted with it. My drivers side sound bar speaker would rattle with any music with a little base. As others have mentioned I could press on the speaker grill or stick my hand...
I had some 1” x 1/4” aluminum bar stock and cut a 1” piece off and drilled and tapped a hole in the center for the cover bolt. I think it was M8. Then I put some good double faced tape on it and stuck it to the back side of the bed where the nut should have been. It took a few tries to squeeze...