Hi confused,
Chesseroo and semi-on are right on the money. I'm afraid you upgraded to too small a speaker. Quite apart from commenting on specific Axiom models, an old colleague and friend used to say to me, "you can't get a quart from a pint pot. . ."
The M1 is a very small speaker. I suggest you think about replacing them (or moving them into a surround role--you could use all four) with M22ti's and you'd recover your missing midrange. Axiom does have an upgrade program.
If you are listening in stereo, the soundstage should spread evenly across the front from the left to the right speakers. Are you sure you haven't inadvertently switched your system to mono? Then everything would be focused exactly in the center, as if the center speaker was on.
Regards,
