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      08-16-2011, 12:50 PM   #9
DavidZ
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Drives: '11.5 E90 M3
Join Date: Apr 2011
Location: Maryland USA

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I have the standard Hi-Fi system, and although I've upgraded my amp and speakers, I'm quite convinced this sound came from the head unit. I also don't think it was a physical problem like a wire getting shorted; I think this car is so "computerized" that sometimes the software acts up and causes things like this.
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'11.5 M3 sedan | Jerez Black Metallic | 6MT | M Performance Exhaust | no DCT no EDC no NAV no nonsense