I have nearly 3000 watts in my stereo, I understand that there will bw some rattles but they are driving me crazy. I have about 12 cans of Dynamat Dynashield and about 25 sq. ft. og original Dynamat in my car. Now, after about 3 monts it sounds as though I do not have any sound dampeing material. Can anyone help me out? I am looking at buying more Dynamat, but does anyone have anything else? Thank you so much for any help.