you have to stop the roof and windshield from moving. best bet is to sound deaden your roof. it will help but other than that you will have to take off the mirror.
The subs are causing the roof to flex which vibrates all the way up to the windshield and then vibrates the mirror.
My mirror never rattled but when cranked i could hear a noise right where the roof line met the windshield. it sounded like something was rattling/rippling sound and if I put my hand on the windshield where I though t it was it would stop.
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