It is very important when installing the mic that it be oriented the right way. There is an arrow on it that should be pointing toward the windshield. If it's pointed the other way then you will experience problems such as what you are describing.

I don't know whether this will work on a 330 or not, but another trick on the X5 is to swap the location of the mic with the location of the sunroof switch so that it is closer to the driver's position.

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