i bought this prodcut
https://fbcdn-sphotos-a.akamaihd.net...59502604_n.jpg
for my speakers as they sounded muddy and vibrated the door distorting the sound, i trimmed to fit used double sided tape to secure put the speakers back in not only did it stop the door rattle and distortion but amplified the sound and makes it nice and crisp at $10 for 2 there amazing and i would highly recommend them to everyone with aftermarket speakers which i assume all of you have