I have Eclipse 6.5" speakers in my front doors. They are run off of a Concept 50x4 amp. The front channel of the amp is running the 6.5s while the rear channel is running the sub. When listening to my Bass Mekanik Cd for about 20 minutes at half volume on the reciever, the speakers will start to pop and you can see blue sparks at night. It just started doing this recently. I have 4volt preouts and my gains is less than halfway. I have no problems with the sub. While it provides a really cool visual effect at night, it sounds bad. It goies away when i turn the volume down. Also, it sounds like the speakers are panned all the way to the left or right. Both speakers are playing, but things like guitar solos that usually play through either the left or right speakers and not both are barely audible. Could this be in the head unit? The panning is centered. My headunit is a Sony CD5050X. All help is appreciated. 1984 K5 Blazer w/ 33" BFG All Terrains, 305, auto, no lift. 4" lift and 350 coming soon.