Ok here is the situation:
I have alternator whine, and usually a bad ground is the cause.
tried regrounding several times (sanding off paint and getting a nice ground on my amps) but it has not worked.
from the back of the receiver, i tried this:
headunit connected to two amps (biamplied 4 channel, and sub amp)- noise
all rca cables disconnected from headunit - no noise
ipod, 1/8 jack to rcas near headunit to amp = no noise
tried regrounding headunit= noise
the headunit is a pioneer premier 880prs... could this be an issue from internal headunit grounding?