Hi, Quick question (sort of): Say that a car passes in the hood in a street near your house, it's speakers booming Mozart. At first, you only hear the muffled sounds, but as the car comes into a certain range not only you hear it clearly, but your window vibrates. Since this changes with distance, I guess this is related to Doppler effect (I'm wrong, aren't I?). Anyone care to explain? References are welcome! Thanks a lot!