1998 Dodge Dakota Sport with the 5.2L V8. I have upgraded the 6.5s in the doors with Boss Audio Onyx coaxial speakers, I recently put in a 10in Boss Audio Diablo Sub in a box behind the drivers seat. Which was a tight squeez because its a regular cap, I also have a 500watt Crunch amp screwed in between the drivers seats on the back of the cap wall. but the problem is when I turn in up the door pannels start to shake and vibrate aginst the door so it sounds like the speakers are blown out. Please help!!! And I can try to answer any questions about how I put the system in or anything!

 

try this out

http://www.dynamat.com/products_car_audio_door_kit.html

 

I ended up stuffing part of a swimming noodle from my pool in the storage compartment on the door. Works fine for now