Tony, welcome. None of the Axiom speakers, including those which have been assigned a 4 ohm rating, should have any difficulty at safe home listening levels with receiver amplifiers from the major manufacturers rated in the 100-150 watt area. This certainly applies to the Yamaha that you have on order, but I'd suggest that you also consider similar Denon and Onkyo models with Audyssey MultEQ room equalization, which is more advanced than the Yamaha system. A very good buy at this time is the factory refurb(which should be at least as reliable as a brand-new unit)Onkyo 3007 available
here for about $900.
As to the speakers, if you're referring to the side surrounds in a 5.1 setup, you might consider using the larger QS8s.
