lowrider57: yes this is the correct link, it is a receiver.
The line 2 out only works for analog sources, which is not ideal but fine; but the main issue is that there is no volume control for line 2 out. The carver has no volume control either (only level knobs in the back). That's mostly what's driving me to wire this way.
So I found the line 2 out of the onkyo to be pretty useless, but I like everything else it offers (ipod connection, dolby decoding, etc)