I don't think that you've read accurate commentary from what you mention in your first paragraph. The basic function of MultEQ is to correct for sound variations which are caused by all listening rooms. The loudness level isn't a factor. Dynamic EQ is a separate function available with Audyssey which compensates for the lower sensitivity of our ears to bass and treble at low sound levels by increasing the relative level of bass and treble as the loudness level drops. These aren't competing functions; they address different problems.

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Enjoy the music, not the equipment.