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.
