I have, on several different occasions, had a loud speaker buzz coming from the car. I heard the first time faintly while sitting at a drive through (strangely it only seemed to happen at a certain drive through). However, last weekend during a long drive to Vegas it showed up very loud to the point the passengers had to talk over it. It was intermittent for about 10 min then went away for the rest of the trip and didnt reappear on the return drive. Any idea what could be causing it? Has anyone experienced anything similar? I couldn't find any recounts of anyone having this same problem.. I've seen mention of vibration type sounds coming from the dash but mine sounded very electrical (speaker) in nature.