My post has nothing to do with your post, I have the same problem though and it's an annoying bitch. I only have 6x9 sony xplods and 6 1/2 xplods in the front but it still rattles. Anyway: I just needed to know which wires are the positives and negatives. Like what color is positive and what color is negative from the car. My idiot ex friend told me it didn't matter which end went where...
I have an 03 cavalier as well.