I have a 2008 F-250 SD with the factory 8 speaker system and factory amp.
I have great sound through all of the speakers when I have the volume turned up above 9 or 10. As soon as I turn the volume down under 9, the front Left speaker goes out with no sound. If I turn the volume back up it comes back on.
Went to the installer and they checked the wiring and the connections. I also had the problem speaker replaced. No change.
Any ideas on a solution?