Even though I belong to the niche M40 posse, I thought I'd chime in. The M40s are a very easy speaker to get along with and partner up well with just about every type of music. You may not get the "wow" factor with some recordings like you do on other speakers, but, like Mojo alluded to, the gap between well and poorly mastered music is diminished. Everything hits a pleasant status quo.

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"Nothin' up my sleeve. . ." --Bullwinkle J. Moose