I have heard both, but not head-to-head. The 900U was good but lacking in the bass. The M10X is stellar from the top down with a beautiful, slightly warm midrange. If I were to purchase one, it would be the M10X
Owned both. 900U and M10x are similar sonically with the M10x having better detail and tighter bass. One thing though, both share a very polished sound that can boarder on fatiguing on the wrong speaker. A more forgiving speaker with less upper frequency energy would work best. These amps work well will an Audio Research preamp for what ever reason.
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