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      01-09-2013, 07:47 AM   #13
I pass gas for a living.

1swift1's Avatar
Drives: 2011 VO 1M
Join Date: Nov 2010
Location: Northern California

Posts: 86
iTrader: (1)

This comes to mind

I had a similar issue with my HK system in my E46 M3. Drove me nuts. I saw this DIY:

It worked very well. However, I'm overseas and can't look at my 1M to see if there is a similar speaker in the rear deck.

FWIW: I haven't heard any rattles yet from that area with my HK stereo, but I also have only put about 6K miles on the car and haven't turned up the volume very loud.