Hello guys Recently got around to upgrading the sound system in my car, i replaced interiors with 3way 6 1/2's and 5way 6-9 rears. I have a 600w 4 channel amp i want to run my interiors, the 1100w amp is running 2 12's in the trunk. I have the deh-xx6500bt pioneer headunit, that has 2 sets of rca outputs one for sub one rear. When set to rear/sub on my hu menu i get bass but no interior. When set to sub/sub its the same thing. When set to rear/rear i get nothing. Now if set in rear/rear and i plug the rca from my sub amp to my interior amp they actually play music and work. Now i know your thinking my rear rca outputs may not be working properly. But i have the exact same hu in the wifes car, few months old. I swapped them out and am having the same results as the first headunit. Leading me to beleive there are slim chances both had busted rear rca parts. I dont know much about the settings on the interior amp, ive only had one for a sub, but everything appears to be right. If anyone has a suggestion id be happy to try it! I just want my system working, thanks !