I have a 2000 Honda Civic Coupe EX and I just got new speakers and a deck installed. I have 2 way in the front and 3 way Pioneers in the back. The plastic covering that covers the whole entire back of car behind the seats and below the back window is rattling when I turn the music up. I've tried insulating the speakers and put foam around where they sit and it still makes the same rattling noise. What should I do?