Originally Posted by 802-303
Pioneer's normally show ground loop issues more than any other h/u's. A few things you can try are.
1) Better grounds. Amp, h/u, and factory subaru grounds.
2) Make sure rca's and speaker wire are complete opposite side as power.
3) ground your rca's to radio ground/ amp ground. (rap copper wire around all 4 rca's, then ground to amp on one end, h/u on other end.)
You are getting a "ground loop" because your dealing with different ground paths between a common system..
Does the remote wire also need to be separate from the power? Thats the only one that runs with the power to the trunk.
Thank you though and everyone else, lemme try everything and ill let you guys know what does the trick