Robb, although I'd be inclined to go with the M2s, if whatever the "emphasis" is(you're having trouble targeting it and you're right there; it's even tougher for us)has to do with positioning rather than the M3 "hump", then the M2s wouldn't solve the problem. Since the top speaker is diagonally a foot or so farther from your ears when you're sitting, check if the sound is different when you stand and the distances to the two M3s would be about equal.

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Enjoy the music, not the equipment.