I have an 02 altima with kicker components in the front. I already have a layer of dynamat extreme on the whole door. The sound is a little hollow and there is still a little vibration when there is heavy bass. My buddy complains that he gets a little fatigued when listenening to my music due to the hollowness. Will another layer of Dynamat or some other sound deadening material help with the hollowness and small vibrations? Thanks