So, when I play a sd-dvd in the A3, and the A3 is hooked up via HDMI in the 510 avr, it won't upconvert it? The 1080i tv is plugged into the AVR as well.
HD Cable Box
HDMI 1080 TV
As far as the audio, my question is, can the 510 handle the cable box and the a3 optical audio at the same time? I want to be able to switch the inputs from the 510. So, when a hd dvd is done playing (at 640k audio via optical), and I want to watch hd tv, I just change the input from the receiver, and still get 640k optical audio from the cable box.