I would agree with pretty much all that has been said, however, like "Solarrdadd" mentioned, in future, I might suggest investing in one or two outboard multi-channel power amps hence, even using your AVR as a pre-pro and avoiding the possible speaker resistance issue. Dedicated power amps don't become obsolete, power ratings/channel are generally better(and more realistic) and they tend to be more flexible in handling the anomalies of various speaker sizes and models.