Hey guys, I have a question. I'm running focal polyglass components up in front powered by a rockford fosgate 851x and 2 8" kickers in back, all on different channels. The system sounds great, but from time to time, when the volume is off, I will hear faint crackling noise from the front right speaker while the cars moving. When the cars idling, I've never experienced this problem. Is this due to amp noise? Or is something in the door rattling? Its not a big problem cause its very faint and if the music is on, you cant hear it, but I was just wondering. Thanks