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Try turning off (or down all the way) the speed sensitive volume control in iDrive. My guess is that the system wants to increase the sound (and maybe disprortionately the bass, which suffers most from high speeds) and is doing the opposite instead. I'm just finishing break-in and have only went just over 100mph for a few seconds and I had the audio off.
Do you have premium audio with enhanced bass or standard Logic7?
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