No sure if I found it but it hasn't been there for about 5 days now. I took out the speaker again and saw nothing underneath that could cause noise except maybe a couple of cable ties around wiring. I tucked in the long ends of these and put speaker back in and so far no noise. I talso could have been something inside the speaker that was stabilized by just taking it out.

Anyway, I'm sure this was too easy and do expect the noise back at any time since I tend to be pessimistic when fixing car "things"

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