I found out that the rear RCA output on this stereo is non controlable from the HU. Its used to drive a dvd setup with headphones or whatnot. Just thought I would share what I found out from Pioneer. Also, I noticed that the radio would play the access noises(cd fininding start of disk or disk type) thru the system amps. I asked the tech about that and he said it was a common problem. Something to the effect of cramming all the features into this stereo.