I’m familiar, but the fact that Yamaha made a point of saying that only the front speakers could be 4 ohms does not inspire confidence. I’ll wait for the more robust models.\n\nAll Yamaha AVR's that are current, are 8 Ohm front and 6 Ohms. Doesn't mean they won't drive a 4 Ohm load on Center and Surrounds. I can tell you for a fact that they can. I've have ran 4 Ohm loads on all channels with my TSR-7790 No issues. Give it a shot and see for yourself if you don't like it return it.