I have some advice: Do not use the RCA outputs. The factory amp was designed to be driven at speaker level; 4V RCA outputs seem to work better than 2V outputs, but the two cars I modded, I found much better audio by using speaker outputs.

Also, do the four channel mod while you are at it, you will thank yourself (and me) later.

Click HERE:
https://www.crossfireforum.org/forum...-channels.html