The number of reviews on this page may reveal which floor-stander Axiom sells the most of. I think while they sold more of the M80 due to the small difference in price, the M60 has not been an unsung hero.
https://www.axiomaudio.com/floorstanding-speakersSure Axiom tests well beyond spec but what does that really mean? I think what it means is you can exceed the maximum ratings, to a point, and not damage the speaker. It doesn't mean you won't hear the effect of playing them out of their specified range.
With regard to playing them to their full potential, I expect a 2-channel ADA-1000 would do that with your version of the M60. With the M60v4, the ADA-1000 would quit before the speakers do.
