My Onkyo has a much wider range of speaker settings for the speakers. I would strongly suggest that you read the Onkyo manual where they describe individual manual speaker setup. That should give you a few ideas.

Which Onkyo do you have?

The Rat. M80s, VP-150, QS8s, SVS PC 20-39+, OPPO, Onkyo 703s, Harmony 880 Sony 60" SXRD HDTV