i have the shaker 500 in my car which really aint bad. but if i turn up the volume to about under half the right door sub sounds like it isshaking inside the door. or there maybe a screw in the door. i really dont know. it happens everytime the bass hits. any ideas how to fix so i can enjoy my music again. do u think since its under warranty they will fix it?

 

If they warranty it then take it back! Like u said it could be a bolt, rock or even a rivet thats in there. If they dont warranty it, take the door panel off and have a look.

 

both of our mustangs do that also. mine on the right side and my moms on the left. It is annoying. I thought it was a blown speaker or something. lemme know what find out.