I have an 04 Mustang GT, I installed a Pioneer AVH-4400BH. The sound quality is very uneven an my door speakers are very quiet. So the back speakers, as well as the tweeters are working fine, but the door speakers are almost non existent. I used a whirring harness adapter that came with the amp RCA cables so it should have worked right? Maybe there is a front and back output on my new head unit? Any help would be greatly appreciated.
5 Speed Manual
Mach 460 stereo