Almost everyone I've called complained about the microphone quality, going as far as saying it is worse than my iPhone's speakerphone quality. This even occurs when I have the car off and parked. I'm using the included mic and have it mounted on the a-pillar. I sound like I'm under water apparently. I'm really frustrated about this. Could it be possible I have a defective mic? 2000 Impreza RS with 8000nex. Thanks.