Need help isolating the source of my audio whining.

[YarisSedan]

So its a constant whine thats there no matter what the volume setting is at. Even with the volume at zero you can hear it. It dosnt change pitch with rpm nor does it increase when things like the headlights or defroster are turned on.

I ran a seperate ground to the head unit to see if it made any difference if it did i cant tell. My only guess is it could be the power wire is running too close to the rcas. I have the cable running behind the dash and through the passanger side where the seat is so it is close to the wires in one spot. If i have to i would run it through the firewall under the drivers seat and then under the arm rest directly to the amp so its no where near the rca cables. But if im gona do that I would like to check all other possibilities first.

I do notice the higher my gain setting on the amp is the louder the whine is.

The ground for the amp is good, its a few inches away from the amp there just happend to be a 10mm bolt hole so sanded down the area and ran a bolt through.