not sure what is causing this just started to happen, but today when i came to a complete stop my speakers went out and all i could hear was the bass from the sub. once i started moving then i could hear the music from the speakers and then when i hit the brakes it did the same thing. but the speakers started back when i started moving. the speakers went out only when i hit the brakes hard. i got to the house to check and see if any of my receiver's wires had come undone but everything was still plugged together. and everything worked fine in the driveway. what could be causing the speakers to do this. its not just one speaker but all of the speakers. only thing that was playing when the speakers went out was the sub. its started happening today.