the front speaker pre-out from my head unit isn't working properly. its just the white one; the red works fine. my music is in stereo so if i use a y splitter it will only play half of the music. and the rear speaker pre-out is the same way. what can i do?

 

sounds like the left RCA ground is bad (front and rear share a ground)

try grounding one of the left RCA shields.

 

I fixed it it was a loose connection on my ipod input. everything is done except mounting the amp. ill do that later thanks for the help