This morning, as soon as I started the vehicle and started backing down the driveway, an unbelievably loud popping sound emitted from the speakers. I immediately slammed on the brakes having no idea what had just happened. This has happened previously but have not heard in a few months so I thought the problem was corrected. It is the loudest noise I have ever experienced and is extremely dangerous as it happens at different times and is just ear splitting. My ears are still ringing and it happened at 8:45am this morning.