Just comparing these on Pioneer's website and other than DVD Audio / SACD playback (and obviously the 5.1 outputs) I initially didn't think there was much difference, but I notice it says the 575 has "Delay adjustment" and the 470 doesn't. What exactly does this mean? (why don't they have the manuals for download!). Does the 470 not compensate for the audio when using progressive scan, or does this mean something else? Thanks in advance... Rob.