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Noise Cancellation: How to tell it is working?

11K views 11 replies 7 participants last post by  Cobra427  
#1 ·
Been thinking about this as I crest over the 12,000 mile mark on some really crappy highways after this winter has been beating the heck out of them. But anyway, sounds kinda like thunder on the inside of the car at times. When on good pavement, the car is quiet as can be. I guess there is a point where the system would lose effectiveness. Just hard to tell when that is.