Audio is, or can be, an expensive hobby, so I and, I presume, most posters here, have to decide where to invest their limited resources and where to hold back. Over several years, I tried various power cords, factory assembled and DIY, shielded and unshielded, UP-OCC copper and regular OFC or ETP copper, with ordinary Marinco and Hubbell connecters and with some quite expensive Furutech and Wattgate ones, and given equal AWG, I can never hear a difference. For me, that's been liberating, because I now feel free to focus my resources on upgrades and changes that to my ears do make an improvement: better components, room treatment, and, of course, more music to play!
That said, I have no problem with those listeners who switch in a new power cord—or IC or speaker cable, for that matter—and find real improvement in the performance of their system. Indeed, I'm glad it works for them! For me, it's just something that I don't investigate anymore. To be sure, there are hundreds of power cords I've never tried—some of them exceeding in price almost any one of my Bryston components—but then there's hundreds of components and speakers that I've never tried. For now, I'm just waiting to take delivery on some new (for me) discs from the Hadouk Trio and from Azam Ali (recently moved from LA to Montreal), among others: "yad yat te karoti tat tat kuśalam evāsti" (Sanskrit for "Whatever works for you is a very good thing").
