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i have to have it turned up loud to drown it out. they go through the grommet that the main loom goes through on the passenger side.(the easy stuff) and wiggled the wires at the back of the stereo but its still there.I asked God for a bike, but I know God doesn't work that way.
im getting the whine through speakers but also ive noticed that if my sub is at full whack and the cd is paused then i can see the sub moving, like its breathing or something 
originally I had teh power to teh amp and te phono leads going down the centre channel, big mistake. Routed teh phonos behing the trim under teh treering wheel and then down the driver door footwell. This made the power steering whine better but did not get rid of it. This virtually stopped all the power steering noise. i can still hear it if teh car is not moving and im moving the steering wheel and Im specifically listeneing for it. Turned out to be where i had put the crossover for teh passenger speakers. This was picking up interfearance from wiring in the passenger footwell. Moved teh corssover into teh glove box and roberts your fathers brother. If yuo still have the problem cahnces are its at the amp side. if not try changing the head unit ground or grounding yoru RCA leads, easy to do wind some wire roung the male part of the RCA connector before you plug it in and then attac the other end of the wire to the head unit ground - apparently this helps with Pioneer systems especially. I originally though i had a problem with all of them do to the fullness of sound from the feedback, turned out to be just from teh front passanger speakers. my speaker amp is mounted behind the drivers seat too and the cross overs are in the doors, phono's are going down the center tunnel aswell. looks like im gunna rip it out and start again on your ideas 
If yuo still have the problem cahnces are its at the amp side. if not try changing the head unit ground or grounding yoru RCA leads, easy to do wind some wire roung the male part of the RCA connector before you plug it in and then attac the other end of the wire to the head unit ground - apparently this helps with Pioneer systems especially. ..got a massive buzz!(not when I switch off via the key). Turning on is fine. When the speakers were directly to the headunit they were fine. I tried several different ground points for both amp and stereo..done the usual..thick guage cables to chassis, even straight to the battery negative, and both grounds to the same point i still get it. I've installed quite a few stereos and on other cars and most of the time a good gound point sorts that little pop. Cables are the shielded type and power cables routed away from other cables....until the summer...got a questions...these phono cables that you can get with the extra remote cable built in...does that eliminate the need for the blue remote cable (as in use that instead) or is it supposed to be an extra ground for the cable? 
(maybe others) have a pico fuse that blows if you connect rca's with amp power connected this causes the ground loop. So to prevent this always connect rca's when power from amp is off by removing battery fuse. As it goes, I actually have the same headunit in another car which doesn't have the problem. Swapped over and its the same thing. Put the headunit back in the other car and its fine. Tried triple shielded cables still no difference. I think I give up on this, the number of times I've taken stuff in and out soon something is going to break. I just turn the volume down now before switching off....its not as bad as the BUZZZ and whining some people get.