I just wanted to post a relatively quick, painless fix for anyone else who may be having this annoying problem.
Ever since I installed my Infinity 6x9s in the rear deck, there has been a ridiculous ammount of chatter and squeaking from the vibration. I never could find any fix-its on this except to put cotton batting or foam under the deck..... which doesn't work, at least it didn't for me.
Turns out my problem was the plastic part of the deck rattling against the back window and the foam in the C-pillars squeaking against the metal. So here's what I did:
I took the leftover silicone from when I cleared my headlights and ran it around the back edge of the deck where it meets the window, and I put some on the foam in the C-pillars. I applied the silicone and let it dry into a kind of bumper before putting the deck back together.
Now there is no rattle, no chattering, and no squeaking.
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