check my diagram minimizing ground loop

DYohn wrote: OK, but what about between the alternator and the battery?  That looks like a long run of unprotected wire that is connected directly to your source: the alternator.  It needs to be fused at the alt, or at least at your connection block in the front of the car.

Oh, I see what you're saying - yeah that connection block still has the OEM fuse block. It's fused there - i'm replacing the wire from the alternator to the fuse block w 1/0ga. The run from there to the trunk is fused again closer to the battery.

DYohn wrote: You need to set your gains properly!!! Check the Car Audio hot topics forum.

I suppose the gain for the sub could be tweaked a bit, but as far as the full-range F+R, they're done pretty well. Gain is about half on the amps, with the HU's EQ adding 1 level to bass and high-treble, each.