High Pitch Noise When Rolling Down Window

From what you say, it's not the actual motor movement of the window relay that causes the high pitch (my first thought) since you said these were power windows.  But if you let off the actuator with the window at a certain point, the high pitch remains.  That right?  Finger off the control, no motor, the high pitch remains...

That leads to an acoustical anomaly.   With the window at a certain height (and do both front windows do the same thing, or just the driver's?) there is an abnormal pitch associated with that height.  Can you hear that pitch from any other location within or outside the car?  Depending on further study into it on your part, it seems to me that the pitch is heard from your listening position and has to do with geometry...the plane of glass and where it abrubtly ends in relation to your ear.  Do this too:  pinch the closest ear shut and find if you can hear it also with your right ear.  The relationship of space to the window will be different and I'm guessing you might not hear it.

The sensible solution, of course, is not to leave the window at that position.  I'm guessing at this point that the position of the tweeter and its angle is the source of the problem.  If possible, and if it leads to this, try to reposition the driver's side tweeter slightly and see if this problem stops.

(PS:  I have been dead wrong from out in left field before, so...)

I will have to verify, but I belive when the deck is at level 0, there is no noise. Any other level there is this noise in the system. Sounds like RCA's will be the first thing I pay attention to when I pull the doorskins off.