07 pacifica, oem infinity, rca to amp?

sorry but your gonna need a line level converter but don't worry mtx has and electronic converter called the re-q it's pretty cool it takes any signal from a dech whether it be pre amp signal or mid frequency level or high frequency and produces full range for amping your interior speakers or a sub out it is also music sensing and gives you a remote turn on for your amps making your install easier its's also an 8 volt pre out so it makes doodiety amps sound like $$$$ amps you can check it out on mtx's web site, i have used them in many cars especially in bmw's and other luxury cars where individual speakers are factory amped at different frequences and it worked out ever time. hope that helps.