Back story:   Ok, so I purchased my cmax with the intent on using it to move the family around in a nice quiet environment. It was all fine and dandy with just me in the car but as soon as I had a passenger it would randomly have horrible resonant frequencies that would drive me/us nuts. Well, eventually I figured out this was a known issue that plagues many of these cars, I verified it was indeed the ANC by tapping on the microphone when the annoying note was blaring in the car and it momentari