Last time i had stereo, i ran 1 xs3100d in the back, i only ran 1 power to the back, and grounded rear battery in the back. This time I am runnin 2 or 3 runs of power to the back where will have 3 or 4 xs 3100's. Should I run the same amount of ground wires from front battery, or just ground batteries at the back? I have seen both ways, but seeing if one is better or is it just preference?
2 FI bl 18's walled in 2012 scion xb