what is sound tape? will it help the rattling sounds in my truck? i have 2 JL 12's under my back seat. is ther anything i can do to help all the rattling?
Tighten loose parts, bolts, beef up any weak connections, silicone the license plate, trim and mouldings, add more insulation, under the carpet, roof liner, inbetween the walls and crevices, dont leave anything out in the open where it may vibrate against something (cell phone on dash, loose change in the ash tray)etc...
Then theres also sound deadening such as Dynamat, or E-dead. If I missed anything I am sure there are others that can add to the list.