I'd like to hear the answers to this, too.
I'm not convinced that I can hear the difference between a pair of 1N4007s (solid state diodes) and a GZ34 or a 5AR4, once they've been filtered.
I know that I can't hear the differences in power cords, if they are of adequate gauge.
Five miles of wet, arcing cable between my house and the distibution station, crappy nailed-up Romex in my crawlspace, and then the last three feet is supposed to have "dramatic sonic impact" ? I just don't know if I can support that.
John Atkinson had a few interesting things to say about audio voodoo and the placebo effect in this month's Stereophile.
He stated that he thinks the Machina Dynamica "quantum physics chip" that "permanently alters" a CD is hokum.
http://taperssection.com/index.php?topic=37629.0I think that he's joining the Dark Side