Dana, as you know I also had Khartago Extremes, they never had a problem with Axioms, however, when I asked Klaus about driving the 4 ohm Axioms, he chuckled and said they are not 1ohm so no problem, German engineering at its best. I was restricted on space and the Khartago's didn't have much breathing room, so would get pretty hot to the touch, being and A/AB design.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85