You can use any of the analog inputs on the Onkyo. The Aux input is on the front so just get a 3.5mm Y to analog like this (
link).
Hey Highlander,
I don't have any direct input for this thread, but I just wanted to tell you that I checked out your system pics, and your HT room is pretty sweet...good job! I have similar components and a room with an area rug over carpet, just like you have -- it's not a dedicated room, but it's in a step-down living room in our new house. Instead of a dedicated rack, my Blu-ray player and receiver are in a side cabinet of a wall unit. Instead of your big Onk, I have the TX-SR605. I too have the Oppo BDP-83.
But what intrigued me most about your setup is that you have the screen that drops down in front of the smaller display; this is something I am contemplating doing because the wife doesn't want a front projection system, but I need to get something bigger than our 50" Sony SXRD rear pro in this HT room without having to switch out the TV...so I was thinking of going the screen-over-the-screen route like you did. And your 80 or some inch screen size seems like it would be right for me, as well.