Okay I looked at my headunit
link for head unit
http://www.pioneerelectronics.com/PU...rs/DEH-P6900UB
It looks like it has 3 RCA pre-outs (1 I hooked to sub already) I can use RCA cables for input of amp like you're doing. For the output of amp should I take 14 gauge wire to my old wire and pull it through dash then hook to amp? Also, where is a good spot to mount a 4channel amp for main speakers/ where are you putting yours?
2003 grand prix SE
One more thing. Where is the head unit's amp? Will I miss the power from it or will the signal be automatically paired together since the RCA inputs for my new amp are coming from my head unit?