ron thigpen;171255 Wrote: > jonheal wrote: > > > This time, I listened over my speakers. I asked her not to try to > trick > > me, but to simply switch one supply out for the other without telling > me > > which was which. > > A Question: When your wife was swapping out the PS, was she unplugging > > them from the wall or just at the SB? > > The reason I ask is that if the switcher were still plugged into the > wall, and the predominant audible effect of the switcher is due to EMI > > (see John Swenson's post), then it could be that your test didn't > properly control for the principle causal factor. > > --rt No, the wall wart was left plugged in, so -if- EMI produces audible artifacts, than yes, they would have still been present.
The point I came away from the experiment was that everything sounded fine and wonderful while being powered by EITHER supply. I detected no additional noise, hum, grate, scratching, buzzing -- non-music, in other words. What I -thought- I could detect, I could not, with reliability, attribute to one supply or the other. As, I stated before, I have no information as to the quality of the linear supply I was using. All I can say is that I could not reliably pick which one sounded better, or worse. I know some people are down on A/B testing, and that's fine, but the fact of the matter is that it is the only way to (rationally) determine for yourself if something sounds different -- and you need someone else to do the switching -- the power of suggestion is just too, well, powerful! -- jonheal Jon Heal says: Have a nice day! http://www.theheals.org/ ~~~ SB3 (wired - 6.3.1) | Home-brew PC running XP Pro | DENON DRA-395 | PSB Stratus Bronze (2) | Outlaw Audio LFM-2 (1) | DIY Speaker Cables | Dayton Audio Interconnects ------------------------------------------------------------------------ jonheal's Profile: http://forums.slimdevices.com/member.php?userid=2133 View this thread: http://forums.slimdevices.com/showthread.php?t=31758 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
