06-02-13: JfrechI completely agree, and I should have put that on my list.
Bryon, I'd add a #5 to your list... noise the components generate and send back into the line...sometimes this can be substantial...especially with some digital gear or switch mode power supplies...
And to be completely clear about my view, I do in fact believe that addressing power issues can make a substantial, even major, improvement in SQ. It's just that I didn't experience a major improvement from my Hydra 8. In fact, I experienced a bigger improvement in SQ from various DIY power tweaks, which are discussed in this thread. The beneficial effects of clean power are also discussed in this thread.
Having said that, I believe that the effects of power products, beneficial or otherwise, is variable and system dependent.
Bryon

