Patrick, just so that you're not acting under a misapprehension, you should be aware that all the Axiom main speakers from the M2 through the M80, including the M50, use the same tweeter. I don't believe anyone previously has complained about a lack of highs; the very few complaints have been about too prominent highs, probably by those who had become used to less accurate speakers with a rolled-off high end. Unless you happen to have a M50 with a defective tweeter, I wouldn't know the reason for what you report and don't believe that another Axiom model would be significantly different in that area.
