I'm having the same issues with M22's that arrived 2 weeks ago and rock music, just got off the phone with Joe@axiom and his sending 2 resistors to try out.

Little or no "toe-in" also aleviated some strain. This seems to be the biggest issue with an other wise great line of speakers and I wonder if the chief engineer Ian and team are considering toning/tuning down the highs on some models or if possible this can be done by request prior to shipping to accomodate those of us with sensitivities to "sharp" or "accurate" highs.