AVR power ratings are a joke. The majority of makers rate their power with one channel driven and only at 1,000 Hz. The power supplies of AVRs are the minimum possible to achieve the power ratings & have no additional current supply for 4 ohm loads. A properly designed amp has TWICE the wattage at 4 ohms than it does at 8. No AVR in the world can do that, and most of the carriage-trade he-man power amps can't either.

I just finished reviewing a 9-channel AVR (TOP of the manufacturer's line) and it only rated the power with two channels driven).

I've not looked at the Axiom amplifiers, but I will.

My opinion is worth exactly what you're paying for it!