I have the Shaker500, when I turn on the stereo I hear a pop sound coming form the speakers. In CD or radio modes, it does it intermittently sometimes it pops then the music starts, sometimes the music starts then it pops. This started two weeks ago, I have had the car for over 4 months. I took it in to the dealer, they said it was normal. How could it be normal if it just started 2 weeks ago? I know that some aftermarket systems make that sound as the amp turns on. I was wondering if anyone has the same problem.