I just got through installing everything. It all sounds fine except sometimes when it boots up there's a little static in the speakers, but that's no big deal. Anyways I have MEMORY, IGN SENSE, & ILLUMINATION into the car wire harness. Then I have REMOTE, GROUND, and front RCA cables going to the 760 watt amp. Amp is grounded and connected to the battery and speaker wires go into the car wire harness, and it all comes out on the factory speakers (yes, factory. I have to keep the amp gain all the way down and the empeg at like -30db.) No other head unit. No tuner......yet.