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					Originally Posted by  ChrisZang
					 
				 
				let me know if you find a better location 
i actually disabled bluetooth on the AVIC so I don't get accidentally any calls routed to the AVIC     
			
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I had the microphone moved to the upper left corner of the windshield, and I also purchased the new update for the AVIC Z110BT which also changes the Bluetooth software.  Dunno which change did the trick but the Bluetooth works GREAT now.  I haven't had any trouble with conversations even at 70 mph.  My car is a Cayman and the windows were up; that might make a difference for you.