Micah, yes I also didn't bring it up in the previous post on "driven hard", but as Steve points out now, the electrical resistivity of metals increases with temperature, by a factor known as the temperature coefficient. So, when a speaker would be driven so hard as to heat up its voice coil wiring, the impedance would increase, not decrease.

On the distortion question, it's not a question of "quality", but rather audibility. The THD figures mentioned are all far below the threshold of audibility when listening to music(generally 1.0% or more), and any review which would somehow relate these numbers to greater "clarity" has no factual basis.

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Enjoy the music, not the equipment.