Now before I get into detail I just want to point out that I have seen and heard of the way of how to wire a 4 channel amp. I have even seen the howto from the Crutchfield site which is also btw more than 5 years old.
Now I have a 4 Channel amp, or had the amp installed in my Scion xB, which I had to remove because I ended up get an Eclipse. When Best Buy had wired my amp in my Scion, they didn't run the wires from the door speakers to my amp, instead they kept the factory wiring and ran the speaker wire from the amp and butt connected the amps speaker wire to the after market wiring harness. The just made sure that the wire harnesses speaker wire was no connected to the HU.
The only thing that was connected to the HU, was Ground, ACC, Illumination, Dimmer, Antenna, Remote(From Amp) and RCA(From Amp) for Sub Inputs. I was wondering if it was ok to continue to wire this way and avoid the frustration of running wires from the door and reduce clutter?
ht tp:/ /tiny .cc/IoWe2b
remove spaces to see image of example.