I would think so, yes. If it were me, and I was still seeing 480p as the incoming signal to the TV, I would look for some setting on the Onkyo which tells it which resolution to output. The Onkyo may be set to just pass through whatever resolution is is receiving. I don't know if there is such a setting, but I would check to see if there is one.
I'm currently download the 606's manual to see if I can find anything definitive, but the download is so slow I thought I would go ahead and post this. If I find anything helpful, I'll let you know.
There is the option to change the out put over the HDMI. I've tried several different ways, currently have it set at 1080i output.
